Add ui-structure.md — full UI inventory and widget taxonomy

Covers all 7 nav sections with layout descriptions, all 11 dialog types,
recurring widget patterns (split pane, tabbed view, table, gallery, card,
field editor, modal dialog, non-modal overlay, full-page sub-view, canvas,
lightbox) with every instance listed, complete template inventory (41 entries),
and a primitive taxonomy for a future higher-level UI representation.
Linked from CLAUDE.md.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,400 @@
+# CLAUDE.md — Electronics Inventory
+
+Agent orientation file. Read this before touching code.
+
+---
+
+## What this project is
+
+A self-hosted electronics inventory web app. Tracks components, PDFs/datasheets,
+physical storage grids (photographed and de-perspectived), and bins. Single-user,
+no auth. Node.js + Express 5 backend, vanilla JS SPA frontend, flat NDJSON
+key-value store for persistence.
+
+---
+
+## File map
+
+```
+server.mjs                   Entry point. All Express routes. ~940 lines.
+lib/
+  storage.mjs                KV store CRUD wrappers (one section per entity type).
+                             Read this to understand what data exists and its prefix.
+  kv-store.mjs               Flat NDJSON key-value store (Simple_KeyValue_Store class).
+                             Auto-loads on construct, auto-flushes with debounce.
+  grid-image.mjs             Image processing: de-perspective a photo into a grid of
+                             cell images using sharp. compute_bin_size() lives here.
+  ids.mjs                    generate_id() — timestamp-base36 + random suffix.
+                             (Planned: migrate to sequential integers.)
+public/
+  app.mjs                    SPA. All rendering, routing, dialog logic. ~2600 lines.
+                             Sections separated by // --- comments.
+  lib/api.mjs                All fetch wrappers. Read this for the full API surface.
+  lib/dom.mjs                Tiny DOM helpers: qs(), clone(), show(), hide().
+  views/grid-setup.mjs       Grid_Setup class — canvas corner editor with pan/zoom.
+                             Used for both grid source images and bin corner editing.
+  templates.html             All HTML templates (id="t-*"). Injected into body at init.
+  style.css                  All styles. Single file (planned: split per section).
+  index.html                 Shell. Loads app.mjs as module. Nav buttons hardcoded.
+tools/
+  mv-sync.c / mv-sync        renameat2(RENAME_NOREPLACE) binary for atomic rename
+                             without overwrite. Used by settle_image_filename().
+  Makefile                   Builds mv-sync.
+data/
+  inventory.ndjson           The database. All entities in one flat KV file.
+  images/                    All uploaded and processed images.
+  pdfs/                      Uploaded PDF files.
+  thumbs/                    PDF thumbnails (generated by pdftoppm).
+```
+
+---
+
+## KV store — key prefixes
+
+| Prefix  | Entity              | Storage function family   |
+|---------|---------------------|---------------------------|
+| `f:`    | Field definitions   | get_field / set_field      |
+| `c:`    | Components          | get_component / set_component |
+| `i:`    | Inventory entries   | get_inventory_entry / set_inventory_entry |
+| `d:`    | Grid drafts         | get_grid_draft / set_grid_draft |
+| `s:`    | Source images       | get_source_image / add_source_image |
+| `g:`    | Grid images         | get_grid_image / set_grid_image |
+| `ct:`   | Component templates | get_component_template / set_component_template |
+| `pdf:`  | PDF files           | get_pdf / set_pdf          |
+| `bt:`   | Bin types           | get_bin_type / set_bin_type |
+| `bin:`  | Bins                | get_bin / set_bin          |
+
+All `list_*()` functions do a full-scan `startsWith(prefix)` over the store.
+
+---
+
+## Data model shapes
+
+### Field definition (`f:`)
+```js
+{
+  id: string,           // generate_id()
+  name: string,         // e.g. 'resistance'
+  unit: string,         // e.g. 'Ω' — optional
+  description: string,
+  created_at: number,   // ms timestamp
+}
+```
+
+### Component (`c:`)
+```js
+{
+  id: string,
+  name: string,
+  description: string,
+  fields: { [field_id]: string },   // values keyed by field definition id
+  images: string[],                 // filenames in data/images/
+  file_ids: string[],               // linked PDF ids
+  created_at: number,
+  updated_at: number,
+}
+```
+
+### Inventory entry (`i:`)
+```js
+{
+  id: string,
+  component_id: string,
+  location_type: 'physical' | 'bom' | 'digital' | 'grid',
+  location_ref: string,       // free text for physical/bom/digital
+  quantity: string,
+  notes: string,
+  grid_id: string | null,     // set when location_type === 'grid'
+  grid_row: number | null,
+  grid_col: number | null,
+  images: string[],
+  created_at: number,
+  updated_at: number,
+}
+```
+
+### Source image (`s:`)
+```js
+{
+  id: string,             // filename in data/images/ (used as key too)
+  original_name: string,
+  width: number,
+  height: number,
+  uses: ('grid' | 'bin')[],   // which features reference this image
+  created_at: number,
+}
+```
+
+### Grid draft (`d:`)
+```js
+{
+  id: string,
+  source_id: string,      // source image filename
+  rows: number,
+  cols: number,
+  corners: [{x,y}, {x,y}, {x,y}, {x,y}],  // TL, TR, BR, BL in image coords
+  created_at: number,
+  updated_at: number,
+}
+```
+
+### Grid image (`g:`) — result of processing a grid draft
+```js
+{
+  id: string,
+  source_id: string,
+  rows: number,
+  cols: number,
+  corners: [{x,y}, ...],
+  panels: [[{ filename, component_id?, notes? }, ...], ...],  // [row][col]
+  created_at: number,
+  updated_at: number,
+}
+```
+
+### Component template (`ct:`)
+```js
+{
+  id: string,
+  name: string,
+  formatter: string,    // JS function body string, compiled at runtime
+  created_at: number,
+  updated_at: number,
+}
+```
+
+### PDF (`pdf:`)
+```js
+{
+  id: string,
+  display_name: string,
+  filename: string,     // in data/pdfs/
+  thumb_prefix: string, // in data/thumbs/ — pdftoppm output prefix
+  created_at: number,
+}
+```
+
+### Bin type (`bt:`)
+```js
+{
+  id: string,
+  name: string,
+  phys_w: number,       // mm
+  phys_h: number,       // mm
+  description: string,
+  fields: { [field_id]: string },
+  created_at: number,
+  updated_at: number,
+}
+```
+
+### Bin (`bin:`)
+```js
+{
+  id: string,
+  name: string,
+  type_id: string | null,       // ref to bin type
+  source_id: string,            // source image filename (always kept)
+  source_w: number,
+  source_h: number,
+  corners: [{x,y}, {x,y}, {x,y}, {x,y}],  // TL, TR, BR, BL in image coords
+  phys_w: number | null,        // mm — null means infer from corners
+  phys_h: number | null,
+  image_filename: string | null,  // processed output in data/images/; null if not yet processed
+  bin_w: number | null,           // px dimensions of processed output
+  bin_h: number | null,
+  fields: { [field_id]: string },
+  contents: [                     // embedded content items
+    {
+      id: string,
+      type: 'component' | 'item',
+      component_id: string | null,  // set when type === 'component'
+      name: string | null,          // set when type === 'item'
+      quantity: string,
+      notes: string,
+      created_at: number,
+    }
+  ],
+  created_at: number,
+  updated_at: number,
+}
+```
+
+---
+
+## API routes (server.mjs)
+
+All responses: `{ ok: true, ...data }` or `{ ok: false, error: string }`.
+
+```
+GET    /api/fields
+POST   /api/fields                        body: { name, unit?, description? }
+PUT    /api/fields/:id
+DELETE /api/fields/:id
+
+GET    /api/components
+POST   /api/components                    body: { name, description?, fields? }
+GET    /api/components/:id
+PUT    /api/components/:id                body: { name?, description?, fields?, file_ids? }
+DELETE /api/components/:id
+POST   /api/components/:id/images         multipart: images[]
+DELETE /api/components/:id/images/:img_id
+
+GET    /api/inventory
+POST   /api/inventory                     body: { component_id, location_type, ... }
+PUT    /api/inventory/:id
+DELETE /api/inventory/:id
+POST   /api/inventory/:id/images          multipart: images[]
+DELETE /api/inventory/:id/images/:img_id
+
+GET    /api/grid-drafts
+POST   /api/grid-drafts                   body: { source_id, rows, cols }
+PUT    /api/grid-drafts/:id
+DELETE /api/grid-drafts/:id
+
+GET    /api/source-images
+POST   /api/source-images                 multipart: images[] — creates source records (uses: ['grid'])
+PUT    /api/source-images/:id             body: { uses }
+DELETE /api/source-images/:id             guarded: refused if any grid/bin still references it
+
+GET    /api/grid-images
+GET    /api/grid-images/:id
+POST   /api/grid-images                   body: { draft_id } — processes draft → grid image
+PUT    /api/grid-images/:id/panels/:pi    body: { component_id?, notes? }
+DELETE /api/grid-images/:id
+
+GET    /api/component-templates
+POST   /api/component-templates           body: { name, formatter }
+PUT    /api/component-templates/:id
+DELETE /api/component-templates/:id
+
+GET    /api/pdfs
+POST   /api/pdfs                          multipart: file, display_name, filename
+PUT    /api/pdfs/:id                      body: { display_name, filename }
+DELETE /api/pdfs/:id                      guarded: refused if any component references it
+
+GET    /api/bin-types
+POST   /api/bin-types                     body: { name, phys_w, phys_h, description?, fields? }
+PUT    /api/bin-types/:id
+DELETE /api/bin-types/:id                 guarded: refused if any bin references it
+
+GET    /api/bins
+GET    /api/bins/:id
+POST   /api/bins                          multipart: image, name?, type_id? — upload + create
+POST   /api/bins/from-source              body: { source_id, name?, type_id? }
+PUT    /api/bins/:id                      body: { name?, type_id?, fields? }
+PUT    /api/bins/:id/corners              body: { corners, phys_w?, phys_h? } — triggers reprocess
+DELETE /api/bins/:id                      only deletes processed image_filename, not source
+POST   /api/bins/:id/contents             body: { type, component_id?, name?, quantity, notes }
+PUT    /api/bins/:id/contents/:cid        body: { quantity?, notes?, name? }
+DELETE /api/bins/:id/contents/:cid
+
+POST   /api/maintenance/purge-missing-sources   removes source KV entries whose files are gone
+POST   /api/maintenance/pdf-thumbs             regenerates missing PDF thumbnails
+```
+
+---
+
+## Frontend (app.mjs) structure
+
+Module-level state variables at the top (`all_components`, `all_fields`, etc.).
+All loaded once at startup via parallel API calls, mutated in place on changes.
+
+**Key patterns:**
+- `clone('t-template-id')` — clones a `<template>` into a live element
+- `qs(el, '#id')` — scoped querySelector
+- Dialog callbacks stored as module-level `let x_dialog_callback = null`,
+  set by the open function, called by the init-registered submit/save handler
+- `render()` — top-level re-render, called after navigation or data changes
+- `navigate(path)` — pushes history + calls render()
+- `build_field_editor(rows_el, sel_el, new_btn_el, initial_fields)` — shared
+  helper that wires up field row editing; returns `{ get_fields() }`
+
+**Section layout (by line range, approximate):**
+```
+1–90      Imports, state vars, startup data load
+91–250    Helper functions (field rendering, search, formatters)
+251–700   Components section (list, detail panel, edit dialog)
+701–1000  Inventory section
+1001–1600 Grids section (list, draft editor, grid viewer)
+1601–1900 Component templates, field definitions dialogs
+1901–2000 Images admin section
+2001–2450 Bins section (list, source list, types list, bin editor)
+2450–2500 Routing (parse_url, navigate, render)
+2500–end  init() — dialog injection, event handler registration
+```
+
+---
+
+## Image file lifecycle
+
+```
+Upload →  multer writes temp file to data/images/<generate_id()><ext>
+       →  settle_image_filename() renames to original filename using
+          rename_no_replace (atomic, no overwrite); falls back to temp name
+       →  source image KV record created with id = final filename
+
+Grid processing:
+  source image + corners + rows/cols → sharp perspective transform
+  → one cell image per panel → filenames stored in grid_image.panels[r][c]
+
+Bin processing:
+  source image + corners → single de-perspectived image
+  → stored as bin.image_filename (separate from bin.source_id)
+  → source_id is never deleted when bin is deleted; only image_filename is
+```
+
+---
+
+## Code style (owner preferences)
+
+- **Indentation**: tabs, display width 4
+- **Braces**: always, even single-line bodies — `if (x) { return; }`
+- **Naming**: `lower_snek_case` functions/locals/singletons,
+  `CAPITAL_SNEK_CASE` top-level constants, `Title_Snek_Case` classes
+- **Quotes**: single quotes preferred
+- **Modules**: `.mjs` extension always
+- **State**: stateful components must be classes; no bare module-level
+  variables for app state (module scope is for constants and exports only)
+- **IDs**: prefer sequential integers over timestamp+random (migration pending)
+- **No CDN URLs** in HTML; vendor libs via make build from node_modules
+- **Error handling**: try/catch ENOENT, never existsSync-then-read (TOCTOU)
+- **No over-engineering**: don't add helpers, abstractions, or error handling
+  for scenarios that can't happen; three similar lines beats a premature helper
+
+---
+
+## Git conventions (this project)
+
+```
+git config user.name  'mikael-lovqvists-claude-agent'
+git config user.email 'mikaels.claude.agent@efforting.tech'
+```
+
+- Small, logical commits — one concern per commit
+- Stage files explicitly by name, never `git add -A` or `git add .`
+- Always `git status` and read every line before staging
+- Commit message: imperative mood, explain *why* not *what*
+
+---
+
+## UI structure
+
+See [`ui-structure.md`](ui-structure.md) for the full inventory of sections,
+widget patterns, dialogs, templates, and a taxonomy of primitives relevant to
+designing a higher-level UI representation.
+
+---
+
+## Known limitations / planned rewrite notes
+
+See [`future-plans.md`](future-plans.md) for full detail. Key points relevant
+to coding decisions:
+
+- `app.mjs` will be split into per-section view modules
+- KV store will become hierarchical (no more prefix convention)
+- IDs will migrate to sequential integers
+- CSS will be split per section with a build-step concatenation
+- SSE for live updates across devices
+- Generic fields on all entity types (already done for components, bins, bin types)
+- A complete rewrite is planned; this codebase is the learning prototype

future-plans.md

@@ -7,12 +7,69 @@
 `fs-views`, `publication-tool`). Should live in its own Gitea repo as an installable
 npm package (`npm install git+https://...`) so changes propagate rather than drift.
 
+### Hierarchical storage structure
+The current store is a flat string→value map with prefixed keys (`f:`, `c:`, `bin:`,
+etc.) as a manual namespacing convention. This should be replaced with a proper tree:
+collections as top-level keys whose values are `Record<id, object>`. Eliminates the
+prefix convention, makes collection access direct and self-documenting, and removes
+the full-scan `startsWith` pattern from every `list_*` function. Requires a one-time
+migration of existing NDJSON data. Best done as part of the shared library rewrite.
+
 ### Delta / revision tracking
 Add a delta log alongside the main snapshot file (e.g. `inventory.ndjson.deltas`)
 that records every `set`/`delete` as a timestamped entry. The main file stays a
 clean current-state snapshot; the delta file accumulates the full history. Enables
 undo, audit trails, and debugging data corruption.
 
+## Real-time / live updates
+
+### Dual event bus architecture
+
+Two independent buses, bridged by SSE:
+
+**Server bus** (`lib/bus.mjs`, Node `EventEmitter`):
+- Route handlers emit a specific event after each mutation (`field:deleted`,
+  `bin:changed`, etc.) and nothing else — side effects are not inline
+- Effect modules in `server/effects/` subscribe and handle cascading work:
+  - `field-effects.mjs` — strips deleted field from all components/bins/bin types
+  - `sse-effects.mjs` — broadcasts mutations to connected SSE clients
+  - `audit-effects.mjs` — writes delta log (future)
+  - `bin-effects.mjs` — e.g. propagates type dimension changes to bins
+- New cross-cutting concerns (audit, cache invalidation, notifications) are
+  additional listeners — route handlers never grow
+
+**Client bus** (`lib/bus.mjs`, lightweight pub/sub or `EventTarget`):
+- `api.mjs` emits on the bus after every successful mutation
+- `sse.mjs` (SSE connection client) translates incoming server events to bus emits
+- View modules subscribe to relevant events and re-render; they never call each other
+- `mock-api.mjs` also emits on the same bus after in-memory mutations, so views
+  react correctly in mock mode without any SSE
+
+**SSE bridge**: `sse-effects.mjs` on the server broadcasts to connected clients;
+`sse.mjs` on the client receives and re-emits on the client bus. Views are unaware
+of whether a change was local or remote.
+
+**Avoiding wildcard listeners**: instead of a wildcard `*` listener (not natively
+supported by `EventEmitter`), emit a generic `mutation` event alongside every
+specific event. The SSE broadcaster listens to `mutation`; everything else listens
+to specific events. New event types are automatically forwarded without touching
+the broadcaster.
+
+```js
+function emit(event, data) {
+    bus.emit(event, data);
+    bus.emit('mutation', { event, data });
+}
+```
+
+**Event granularity**: collection-level events are sufficient (`bins:changed`,
+`components:changed`). Passing the affected id or record is optional — views can
+use it to do a targeted update or ignore it and re-fetch the collection. Fine-grained
+events are an optimisation to add later if full-collection re-fetches become slow.
+
+Ties into the delta tracking plan: `audit-effects.mjs` is another bus listener —
+the same mutation path that drives SSE also drives the delta log.
+
 ## App architecture
 
 ### parse_url mutates too many module-level variables
@@ -44,10 +101,46 @@ const SECTION_RENDERERS = {
 function render() { sync_nav(); SECTION_RENDERERS[section]?.(); }
 ```
 
+### UI as a self-contained sub-project
+
+The UI boundary is `api.mjs` — every piece of data the UI touches goes through
+named exports in that file. This seam should be made explicit so the UI can be
+developed and tested against a mock without a running server.
+
+**Composition root / dependency injection**: `app.mjs` should not import `api.mjs`
+directly. Instead it receives the api implementation as a parameter. Two thin entry
+files wire it up:
+
+```
+main.mjs       — imports real api.mjs, passes to app.start()
+mock-main.mjs  — imports mock-api.mjs, passes to app.start()
+```
+
+`mock-main.mjs` is a separate deployable (e.g. served at `/mock` or on a dev port),
+not a URL flag. The app has no runtime knowledge of which implementation it received.
+
+**mock-api.mjs**: same exports as `api.mjs`, backed by in-memory arrays seeded with
+realistic fixture data. Mutations update the in-memory state so the UI behaves
+realistically (add/delete/edit all persist within the session). Also emits on the
+client bus so cross-view reactivity works identically to the real app. No SSE
+connection needed in mock mode — the bus events come from the mock mutations.
+
+**Views never call each other**: once split into modules, `views/bins.mjs` must
+not import `views/inventory.mjs`. Cross-section reactions happen exclusively through
+the client bus. This is the main structural discipline that makes the split work.
+
 ### app.mjs monolith
-`app.mjs` is large. Consider splitting into per-section modules
+`app.mjs` is large. Split into per-section view modules (`views/components.mjs`,
-(`views/components.mjs`, `views/grids.mjs`, etc.) that each export their render
+`views/grids.mjs`, `views/bins.mjs`, etc.) each owning its local state, subscribing
-function and own their local state.
+to bus events at init, and exporting a single `mount(container)` function. The
+composition root (`main.mjs`) imports all view modules and registers them.
+
+### Split CSS into per-section files
+`style.css` is a single large file and getting hard to navigate. Split into
+per-section files (`components.css`, `grids.css`, `bins.css`, etc.) plus a
+`base.css` for variables, resets, and shared layout. A `make build` step can
+concatenate them into a single `style.css` for deployment, keeping the dev
+experience clean without adding a bundler dependency.
 
 ### Explicit save in component editor
 Currently any change in the component detail panel (linking a file, unlinking an
@@ -174,6 +267,13 @@ Some fields naturally belong together (e.g. `frequency_stability` and
 Structured records are the more powerful option but require a schema system and
 more complex UI. Grouping/linkage is a lighter short-term win.
 
+As fields are shared across entity types (components, bins, bin types, and anything
+else added later), the field pool grows to span unrelated domains. Groups also serve
+as a domain filter in the field selector — when adding a field to a bin type, you
+should be able to filter to e.g. "physical" or "storage" fields rather than seeing
+electrical component fields mixed in. Each field should be able to belong to one or
+more groups.
+
 #### Semantically-aware formatting (acronyms, proper names)
 Formatters that apply title case or similar text transformations can corrupt acronyms
 (e.g. `NPN` → `Npn`) or brand/proper names. The root cause is that free-text field
@@ -289,10 +389,6 @@ slot targets) in addition to custom formatters.
 This revision also applies to field parsers and search view expressions once those
 exist — they all follow the same pattern of JS function → structured output →
 context-specific renderer.
-Any field that accepts JavaScript (name formatter templates, future custom search
-views, field parsers, etc.) should use a CodeMirror 6 editor instead of a plain
-`<textarea>`. Gives syntax highlighting, bracket matching, and a proper editing
-experience for JS snippets.
 
 ## Search & views
 
@@ -374,6 +470,37 @@ used/visited locations at the top so you can quickly re-select where you just we
 Useful when processing a batch of components into the same storage location — you
 shouldn't have to navigate the grid picker from scratch each time.
 
+## Bins
+
+### Bin types
+Define reusable bin type records (e.g. "Sortimo L-Boxx insert small", "Wago 221
+connector box") that store physical dimensions (mm), and optionally a default
+compartment layout. When creating or editing a bin, the user picks a type and the
+dimensions are pre-filled — no need to re-enter for every bin of the same model.
+This also enables filtering/grouping bins by type, and makes it easy to re-process
+all bins of a type if the corner algorithm improves.
+
+### Generic fields on bins and bin types
+Bins and bin types should both support the same generic field system as components —
+arbitrary key/value pairs from the shared field definitions. Examples: color, material,
+manufacturer, max load, purchase link. Bin types carry the "template" fields (e.g.
+nominal dimensions from the datasheet) while individual bins carry instance-specific
+fields (e.g. actual color of that specific unit).
+
+Because fields are shared across components, bins, and anything else that grows into
+the system, they will quickly span unrelated domains. Field grouping (see Field system
+section) becomes important here so the field selector can be filtered to show only
+relevant fields for the current entity type.
+
+### Duplicate any entity
+All objects in the system should be duplicatable: components, bin types, bins, grids,
+templates, inventory entries, and eventually source images. The duplicate operation
+creates a new record with all fields copied, then opens it in an edit dialog so the
+user can adjust what differs. Bin type duplication is especially common — same
+physical container model in different colors or configurations. Source images are a
+later case since they reference uploaded files; duplication there would mean creating
+a new metadata record pointing to the same underlying file (or an explicit copy).
+
 ## Grids
 
 ### Grid view layers

lib/grid-image.mjs

@@ -86,6 +86,22 @@ function bilinear_sample(pixels, width, height, x, y, out, out_idx) {
 // Public API
 // ---------------------------------------------------------------------------
 
+// Compute natural size for a single de-perspectived bin image (cap at 1024px)
+export function compute_bin_size(corners) {
+	const [tl, tr, br, bl] = corners;
+	const top_w  = Math.hypot(tr.x - tl.x, tr.y - tl.y);
+	const bot_w  = Math.hypot(br.x - bl.x, br.y - bl.y);
+	const left_h = Math.hypot(bl.x - tl.x, bl.y - tl.y);
+	const rgt_h  = Math.hypot(br.x - tr.x, br.y - tr.y);
+	const raw_w  = Math.max(top_w, bot_w);
+	const raw_h  = Math.max(left_h, rgt_h);
+	const scale  = Math.min(1.0, 1024 / Math.max(raw_w, raw_h));
+	return {
+		bin_w: Math.round(Math.max(48, raw_w * scale)),
+		bin_h: Math.round(Math.max(48, raw_h * scale)),
+	};
+}
+
 // Compute natural cell size from corner quadrilateral + grid dimensions
 export function compute_cell_size(corners, rows, cols) {
 	const [tl, tr, br, bl] = corners;

lib/kv-store.mjs

@@ -151,12 +151,14 @@ export class Simple_KeyValue_Store {
 
 	load() {
 		const { data, storage_path } = this;
-		if (!fs.existsSync(storage_path)) {
+		let file_contents;
-			return;
+		try {
+			file_contents = fs.readFileSync(storage_path, 'utf-8');
+		} catch (e) {
+			if (e.code === 'ENOENT') { return; }
+			throw e;
 		}
 
-		const file_contents = fs.readFileSync(storage_path, 'utf-8');
-
 		for (const line of file_contents.split('\n')) {
 			if (!line) continue;
 			const [key, value] = JSON.parse(line);

lib/storage.mjs

@@ -174,6 +174,50 @@ export function find_pdf_references(pdf_id) {
 	return list_components().filter(c => c.file_ids?.includes(pdf_id));
 }
 
+// --- Bin types ---
+
+export function list_bin_types() {
+	const result = [];
+	for (const [key] of store.data.entries()) {
+		if (key.startsWith('bt:')) result.push(store.get(key));
+	}
+	return result.sort((a, b) => a.name.localeCompare(b.name));
+}
+
+export function get_bin_type(id) {
+	return store.get(`bt:${id}`) ?? null;
+}
+
+export function set_bin_type(bt) {
+	store.set(`bt:${bt.id}`, bt);
+}
+
+export function delete_bin_type(id) {
+	return store.delete(`bt:${id}`);
+}
+
+// --- Bins ---
+
+export function list_bins() {
+	const result = [];
+	for (const [key] of store.data.entries()) {
+		if (key.startsWith('bin:')) result.push(store.get(key));
+	}
+	return result.sort((a, b) => b.created_at - a.created_at);
+}
+
+export function get_bin(id) {
+	return store.get(`bin:${id}`) ?? null;
+}
+
+export function set_bin(bin) {
+	store.set(`bin:${bin.id}`, bin);
+}
+
+export function delete_bin(id) {
+	return store.delete(`bin:${id}`);
+}
+
 // --- Grid images ---
 
 export function list_grid_images() {

public/app.mjs

@@ -28,13 +28,21 @@ let highlight_cell = null; // { row, col } — set when navigating from componen
 let all_drafts = [];
 let all_templates = [];
 let all_pdfs = [];
+let all_bins = [];
+let all_bin_types = [];
+let bin_tab = 'bins'; // 'bins' | 'sources' | 'types'
+let bin_editor_instance = null;
+let bin_editor_bin_id = null;
+let bin_editor_get_fields = null;
+let bin_type_dialog_callback = null;
+let bin_content_dialog_callback = null;
 
 // ---------------------------------------------------------------------------
 // Data loading
 // ---------------------------------------------------------------------------
 
 async function load_all() {
-	const [cf, ci, cmp, gr, dr, sr, ct, pd] = await Promise.all([
+	const [cf, ci, cmp, gr, dr, sr, ct, pd, bn, bt] = await Promise.all([
 		api.get_fields(),
 		api.get_inventory(),
 		api.get_components(),
@@ -43,6 +51,8 @@ async function load_all() {
 		api.get_source_images(),
 		api.get_component_templates(),
 		api.get_pdfs(),
+		api.get_bins(),
+		api.get_bin_types(),
 	]);
 	all_fields = cf.fields;
 	all_inventory = ci.entries;
@@ -52,6 +62,8 @@ async function load_all() {
 	all_sources = sr.sources;
 	all_templates = ct.templates;
 	all_pdfs = pd.pdfs;
+	all_bins = bn.bins;
+	all_bin_types = bt.bin_types;
 	compile_templates();
 }
 
@@ -149,6 +161,98 @@ function field_by_id(id) {
 	return all_fields.find(f => f.id === id);
 }
 
+// Attaches a reusable field editor UI to existing DOM elements.
+// Returns { get_fields() } — call get_fields() to collect trimmed non-empty values.
+function build_field_editor(rows_el, add_sel_el, new_btn_el, initial_fields) {
+	const active = new Map(Object.entries(initial_fields ?? {}));
+
+	function rebuild_rows() {
+		const sorted = [...active.entries()].sort(([a], [b]) =>
+			(field_by_id(a)?.name ?? a).localeCompare(field_by_id(b)?.name ?? b));
+		rows_el.replaceChildren(...sorted.map(([fid, val]) => {
+			const def = field_by_id(fid);
+			const row = document.createElement('div');
+			row.className = 'c-field-input-row';
+			const lbl = document.createElement('div');
+			lbl.className = 'c-field-input-label';
+			lbl.textContent = def ? def.name : fid;
+			if (def?.unit) {
+				const u = document.createElement('span');
+				u.className = 'c-field-unit-hint';
+				u.textContent = `[${def.unit}]`;
+				lbl.appendChild(u);
+			}
+			const inp = document.createElement('input');
+			inp.type = 'text';
+			inp.className = 'c-field-value';
+			inp.value = val;
+			inp.autocomplete = 'off';
+			inp.dataset.field_id = fid;
+			inp.addEventListener('input', e => active.set(fid, e.target.value));
+			const rm = document.createElement('button');
+			rm.type = 'button';
+			rm.className = 'btn-icon btn-danger';
+			rm.textContent = '✕';
+			rm.title = 'Remove field';
+			rm.addEventListener('click', () => { active.delete(fid); rebuild_rows(); rebuild_sel(); });
+			row.append(lbl, inp, rm);
+			return row;
+		}));
+	}
+
+	function rebuild_sel() {
+		const available = all_fields.filter(f => !active.has(f.id));
+		add_sel_el.replaceChildren(
+			Object.assign(document.createElement('option'), { value: '', textContent: '— add a field —' }),
+			...available.map(f => Object.assign(document.createElement('option'), {
+				value: f.id, textContent: f.name + (f.unit ? ` [${f.unit}]` : ''),
+			}))
+		);
+	}
+
+	rebuild_rows();
+	rebuild_sel();
+
+	const prev = add_sel_el._field_handler;
+	if (prev) add_sel_el.removeEventListener('change', prev);
+	add_sel_el._field_handler = (e) => {
+		const fid = e.target.value;
+		if (!fid) return;
+		active.set(fid, '');
+		rebuild_rows();
+		rebuild_sel();
+		rows_el.querySelector(`[data-field_id="${fid}"]`)?.focus();
+	};
+	add_sel_el.addEventListener('change', add_sel_el._field_handler);
+
+	if (new_btn_el) {
+		new_btn_el.onclick = () => {
+			const known = new Set(all_fields.map(f => f.id));
+			open_field_dialog(null);
+			document.getElementById('dialog-field').addEventListener('close', () => {
+				const nf = all_fields.find(f => !known.has(f.id));
+				rebuild_sel();
+				if (nf) {
+					active.set(nf.id, '');
+					rebuild_rows();
+					rebuild_sel();
+					rows_el.querySelector(`[data-field_id="${nf.id}"]`)?.focus();
+				}
+			}, { once: true });
+		};
+	}
+
+	return {
+		get_fields() {
+			const out = {};
+			for (const [fid, val] of active.entries()) {
+				if (val.trim()) out[fid] = val.trim();
+			}
+			return out;
+		},
+	};
+}
+
 function matches_search(component, query) {
 	if (!query) return true;
 	const words = query.toLowerCase().split(/\s+/).filter(Boolean);
@@ -893,6 +997,13 @@ function build_source_card(src, selectable, on_select = null) {
 	img_el.src = `/img/${src.id}`;
 	qs(card, '.source-card-link').href = `/img/${src.id}`;
 	set_text(card, '.source-card-meta', [src.original_name, `${src.width}×${src.height}`].filter(Boolean).join(' · '));
+	const uses_el = qs(card, '.source-card-uses');
+	for (const use of (src.uses ?? [])) {
+		const badge = document.createElement('span');
+		badge.className = `source-use-badge source-use-${use}`;
+		badge.textContent = use;
+		uses_el.appendChild(badge);
+	}
 
 	if (selectable) {
 		card.classList.add('selectable');
@@ -1908,6 +2019,450 @@ function confirm_delete(message, on_confirm) {
 	dlg.showModal();
 }
 
+// ---------------------------------------------------------------------------
+// Images (source image admin)
+// ---------------------------------------------------------------------------
+
+const KNOWN_USES = ['grid', 'bin'];
+
+function render_images_section() {
+	const main = document.getElementById('main');
+	main.replaceChildren(document.getElementById('t-section-images').content.cloneNode(true));
+	const list_el = document.getElementById('img-admin-list');
+
+	if (all_sources.length === 0) {
+		const el = clone('t-empty-block');
+		el.textContent = 'No source images yet.';
+		list_el.appendChild(el);
+		return;
+	}
+
+	for (const src of all_sources) {
+		const row = clone('t-img-admin-row');
+		const link = qs(row, '.img-admin-thumb-link');
+		link.href = `/img/${src.id}`;
+		qs(row, '.img-admin-thumb').src = `/img/${src.id}`;
+		qs(row, '.img-admin-name').textContent = src.original_name || src.id;
+		qs(row, '.img-admin-meta').textContent = src.width && src.height ? `${src.width}×${src.height}` : '';
+
+		const uses_el = qs(row, '.img-admin-uses');
+		for (const use of KNOWN_USES) {
+			const label = document.createElement('label');
+			label.className = 'img-admin-use-label';
+			const cb = document.createElement('input');
+			cb.type = 'checkbox';
+			cb.checked = src.uses?.includes(use) ?? false;
+			cb.addEventListener('change', async () => {
+				const new_uses = KNOWN_USES.filter(u => {
+					const el = uses_el.querySelector(`input[data-use="${u}"]`);
+					return el ? el.checked : src.uses?.includes(u);
+				});
+				try {
+					const result = await api.update_source_image_uses(src.id, new_uses);
+					src.uses = result.source.uses;
+					all_sources = all_sources.map(s => s.id === src.id ? { ...s, uses: src.uses } : s);
+				} catch (err) {
+					alert(err.message);
+					cb.checked = !cb.checked; // revert
+				}
+			});
+			cb.dataset.use = use;
+			label.appendChild(cb);
+			label.append(' ' + use);
+			uses_el.appendChild(label);
+		}
+
+		qs(row, '.img-admin-delete').addEventListener('click', async () => {
+			try {
+				await api.delete_source_image(src.id);
+				all_sources = all_sources.filter(s => s.id !== src.id);
+				row.remove();
+			} catch (err) {
+				alert(err.message);
+			}
+		});
+
+		list_el.appendChild(row);
+	}
+}
+
+// ---------------------------------------------------------------------------
+// Bins
+// ---------------------------------------------------------------------------
+
+function render_bins() {
+	let sec = document.getElementById('section-bins');
+	if (!sec) {
+		const main = document.getElementById('main');
+		main.replaceChildren(document.getElementById('t-section-bins').content.cloneNode(true));
+		sec = document.getElementById('section-bins');
+
+		qs(sec, '#btn-tab-bins').addEventListener('click', () => {
+			bin_tab = 'bins';
+			history.replaceState(null, '', '/bins');
+			update_bin_tabs(sec);
+		});
+		qs(sec, '#btn-tab-bin-sources').addEventListener('click', () => {
+			bin_tab = 'sources';
+			history.replaceState(null, '', '/bins/sources');
+			update_bin_tabs(sec);
+		});
+		qs(sec, '#btn-tab-bin-types').addEventListener('click', () => {
+			bin_tab = 'types';
+			history.replaceState(null, '', '/bins/types');
+			update_bin_tabs(sec);
+		});
+		qs(sec, '#btn-add-bin-type').addEventListener('click', () => open_bin_type_dialog());
+		qs(sec, '#bin-source-upload-input').addEventListener('change', async (e) => {
+			const files = [...e.target.files];
+			if (!files.length) return;
+			for (const file of files) {
+				try {
+					const result = await api.upload_bin(file, file.name.replace(/\.[^.]+$/, ''));
+					all_bins.unshift(result.bin);
+					const src = all_sources.find(s => s.id === result.bin.source_id);
+					if (!src) {
+						const r2 = await api.get_source_images();
+						all_sources = r2.sources;
+					}
+				} catch (err) {
+					alert(err.message);
+				}
+			}
+			e.target.value = '';
+			render_bin_source_list();
+		});
+	}
+
+	update_bin_tabs(sec);
+	render_bin_list();
+	render_bin_source_list();
+	render_bin_types_list();
+}
+
+function update_bin_tabs(sec) {
+	qs(sec, '#btn-tab-bins').classList.toggle('active', bin_tab === 'bins');
+	qs(sec, '#btn-tab-bin-sources').classList.toggle('active', bin_tab === 'sources');
+	qs(sec, '#btn-tab-bin-types').classList.toggle('active', bin_tab === 'types');
+	qs(sec, '#btn-upload-bin-sources').hidden = (bin_tab !== 'sources');
+	qs(sec, '#btn-add-bin-type').hidden = (bin_tab !== 'types');
+	qs(sec, '#tab-bins-content').hidden = (bin_tab !== 'bins');
+	qs(sec, '#tab-bin-sources-content').hidden = (bin_tab !== 'sources');
+	qs(sec, '#tab-bin-types-content').hidden = (bin_tab !== 'types');
+}
+
+function render_bin_types_list() {
+	const list_el = document.getElementById('bin-types-list');
+	if (!list_el) return;
+	if (all_bin_types.length === 0) {
+		const el = clone('t-empty-block');
+		el.textContent = 'No bin types yet. Click "+ Add type" to define one.';
+		list_el.replaceChildren(el);
+		return;
+	}
+	list_el.replaceChildren(...all_bin_types.map(bt => {
+		const row = clone('t-bin-type-row');
+		qs(row, '.bin-type-name').textContent = bt.name;
+		qs(row, '.bin-type-dims').textContent = `${bt.phys_w} × ${bt.phys_h} mm`;
+		qs(row, '.bin-type-desc').textContent = bt.description || '';
+		qs(row, '.btn-edit').addEventListener('click', () => open_bin_type_dialog(bt));
+		qs(row, '.btn-delete').addEventListener('click', () => {
+			confirm_delete(`Delete bin type "${bt.name}"?`, async () => {
+				await api.delete_bin_type(bt.id);
+				all_bin_types = all_bin_types.filter(t => t.id !== bt.id);
+				render_bin_types_list();
+			});
+		});
+		return row;
+	}));
+}
+
+function open_bin_type_dialog(bt = null) {
+	const dlg = document.getElementById('dialog-bin-type');
+	dlg.querySelector('.dialog-title').textContent = bt ? 'Edit bin type' : 'Add bin type';
+	document.getElementById('bt-name').value = bt?.name ?? '';
+	document.getElementById('bt-width').value = bt?.phys_w ?? '';
+	document.getElementById('bt-height').value = bt?.phys_h ?? '';
+	document.getElementById('bt-description').value = bt?.description ?? '';
+
+	const { get_fields } = build_field_editor(
+		document.getElementById('bt-field-rows'),
+		document.getElementById('bt-add-field-select'),
+		document.getElementById('bt-new-field'),
+		bt?.fields ?? {}
+	);
+
+	bin_type_dialog_callback = async () => {
+		const name = document.getElementById('bt-name').value.trim();
+		const phys_w = parseFloat(document.getElementById('bt-width').value);
+		const phys_h = parseFloat(document.getElementById('bt-height').value);
+		const description = document.getElementById('bt-description').value.trim();
+		if (!name) { alert('Name is required.'); return; }
+		if (!(phys_w > 0) || !(phys_h > 0)) { alert('Dimensions must be positive numbers.'); return; }
+		const fields = get_fields();
+		if (bt) {
+			const r = await api.update_bin_type(bt.id, { name, phys_w, phys_h, description, fields });
+			all_bin_types = all_bin_types.map(t => t.id === bt.id ? r.bin_type : t);
+		} else {
+			const r = await api.create_bin_type({ name, phys_w, phys_h, description, fields });
+			all_bin_types = [...all_bin_types, r.bin_type].sort((a, b) => a.name.localeCompare(b.name));
+		}
+		render_bin_types_list();
+	};
+	dlg.showModal();
+}
+
+function render_bin_list() {
+	const gallery = document.getElementById('bin-gallery');
+	if (!gallery) return;
+	gallery.replaceChildren();
+	for (const bin of all_bins) {
+		const card = clone('t-bin-card');
+		const img = qs(card, '.bin-card-img');
+		const img_wrap = qs(card, '.bin-card-img-wrap');
+		qs(card, '.bin-card-name').textContent = bin.name;
+		if (bin.image_filename) {
+			img.src = `/img/${bin.image_filename}`;
+			img_wrap.classList.add('has-image');
+		} else {
+			img.hidden = true;
+		}
+		qs(card, '.btn-edit').addEventListener('click', () => open_bin_editor(bin));
+		qs(card, '.btn-delete').addEventListener('click', () => {
+			confirm_delete(`Delete bin "${bin.name}"?`, async () => {
+				await api.delete_bin(bin.id);
+				all_bins = all_bins.filter(b => b.id !== bin.id);
+				render_bin_list();
+			});
+		});
+		gallery.appendChild(card);
+	}
+}
+
+function render_bin_source_list() {
+	const list_el = document.getElementById('bin-source-image-list');
+	if (!list_el) return;
+	const bin_sources = all_sources.filter(s => s.uses?.includes('bin'));
+	if (bin_sources.length === 0) {
+		const el = clone('t-empty-block');
+		el.textContent = 'No bin source images yet. Upload photos of your bins.';
+		list_el.replaceChildren(el);
+		return;
+	}
+	list_el.replaceChildren(...bin_sources.map(src => {
+		const card = build_source_card(src, false);
+		const create_btn = card.querySelector('.source-card-create-bin');
+		create_btn.hidden = false;
+		create_btn.addEventListener('click', async () => {
+			try {
+				const result = await api.create_bin_from_source(src.id);
+				all_bins.unshift(result.bin);
+				render_bin_list();
+				open_bin_editor(result.bin);
+				bin_tab = 'bins';
+				update_bin_tabs(document.getElementById('section-bins'));
+			} catch (err) {
+				alert(err.message);
+			}
+		});
+		return card;
+	}));
+}
+
+function render_bin_contents(bin_id, container_el) {
+	const bin = all_bins.find(b => b.id === bin_id);
+	const contents = bin?.contents ?? [];
+	if (contents.length === 0) {
+		const empty = clone('t-empty-block');
+		empty.textContent = 'No items yet.';
+		container_el.replaceChildren(empty);
+		return;
+	}
+	container_el.replaceChildren(...contents.map(item => {
+		const row = clone('t-bin-content-row');
+		let display_name = item.name ?? '';
+		if (item.type === 'component') {
+			const comp = all_components.find(c => c.id === item.component_id);
+			display_name = comp ? component_display_name(comp) : `[unknown component]`;
+		}
+		qs(row, '.bin-content-name').textContent = display_name;
+		qs(row, '.bin-content-qty').textContent = item.quantity ? `×${item.quantity}` : '';
+		qs(row, '.bin-content-notes').textContent = item.notes || '';
+		qs(row, '.btn-edit').addEventListener('click', () => open_bin_content_dialog(bin_id, item));
+		qs(row, '.btn-delete').addEventListener('click', async () => {
+			try {
+				await api.delete_bin_content(bin_id, item.id);
+				const cur = all_bins.find(b => b.id === bin_id);
+				const updated = { ...cur, contents: cur.contents.filter(c => c.id !== item.id) };
+				all_bins = all_bins.map(b => b.id === bin_id ? updated : b);
+				render_bin_contents(bin_id, container_el);
+			} catch (err) {
+				alert(err.message);
+			}
+		});
+		return row;
+	}));
+}
+
+function open_bin_content_dialog(bin_id, item = null) {
+	const dlg = document.getElementById('dialog-bin-content');
+	qs(dlg, '.dialog-title').textContent = item ? 'Edit item' : 'Add item';
+
+	const type_sel  = document.getElementById('bc-type');
+	const comp_row  = document.getElementById('bc-component-row');
+	const name_row  = document.getElementById('bc-name-row');
+	const comp_sel  = document.getElementById('bc-component');
+	const name_inp  = document.getElementById('bc-name');
+	const qty_inp   = document.getElementById('bc-quantity');
+	const notes_inp = document.getElementById('bc-notes');
+
+	comp_sel.replaceChildren(
+		new Option('— select —', ''),
+		...all_components.map(c => new Option(component_display_name(c), c.id))
+	);
+
+	type_sel.value   = item?.type ?? 'component';
+	comp_sel.value   = item?.component_id ?? '';
+	name_inp.value   = item?.name ?? '';
+	qty_inp.value    = item?.quantity ?? '';
+	notes_inp.value  = item?.notes ?? '';
+	type_sel.disabled = !!item;
+
+	function sync_type() {
+		const is_comp = type_sel.value === 'component';
+		comp_row.hidden = !is_comp;
+		name_row.hidden = is_comp;
+	}
+	type_sel.onchange = sync_type;
+	sync_type();
+
+	bin_content_dialog_callback = async () => {
+		const body = {
+			type:         type_sel.value,
+			component_id: type_sel.value === 'component' ? comp_sel.value : undefined,
+			name:         type_sel.value === 'item' ? name_inp.value.trim() : undefined,
+			quantity:     qty_inp.value.trim(),
+			notes:        notes_inp.value.trim(),
+		};
+		const result = item
+			? await api.update_bin_content(bin_id, item.id, body)
+			: await api.add_bin_content(bin_id, body);
+		all_bins = all_bins.map(b => b.id === bin_id ? result.bin : b);
+		render_bin_contents(bin_id, document.getElementById('bin-contents-list'));
+	};
+
+	dlg.showModal();
+}
+
+function open_bin_editor(bin) {
+	const dlg = document.getElementById('dialog-bin-editor');
+	if (!dlg) return;
+
+	bin_editor_bin_id = bin.id;
+	bin_editor_instance = null;  // canvas not loaded until needed
+
+	document.getElementById('bin-editor-name').value = bin.name;
+
+	// Populate type selector
+	const type_sel = document.getElementById('bin-editor-type');
+	type_sel.replaceChildren(new Option('— Custom —', ''));
+	for (const bt of all_bin_types) {
+		type_sel.appendChild(new Option(`${bt.name} (${bt.phys_w}×${bt.phys_h}mm)`, bt.id));
+	}
+	type_sel.value = bin.type_id ?? '';
+
+	const dims_row = document.getElementById('bin-editor-dims-row');
+	function sync_dims_row() {
+		const bt = all_bin_types.find(t => t.id === type_sel.value);
+		if (bt) {
+			document.getElementById('bin-editor-width').value  = bt.phys_w;
+			document.getElementById('bin-editor-height').value = bt.phys_h;
+			dims_row.hidden = true;
+		} else {
+			document.getElementById('bin-editor-width').value  = bin.phys_w ?? '';
+			document.getElementById('bin-editor-height').value = bin.phys_h ?? '';
+			dims_row.hidden = false;
+		}
+	}
+	type_sel.addEventListener('change', sync_dims_row);
+	sync_dims_row();
+
+	// Image preview (default view)
+	const view_image   = document.getElementById('bin-editor-view-image');
+	const view_corners = document.getElementById('bin-editor-view-corners');
+	const preview_img  = document.getElementById('bin-editor-preview');
+	const no_image_el  = document.getElementById('bin-editor-no-image');
+
+	function show_image_view() {
+		view_image.hidden = false;
+		view_corners.hidden = true;
+	}
+
+	function show_corners_view() {
+		view_image.hidden = true;
+		view_corners.hidden = false;
+		// Lazy-load canvas the first time
+		if (!bin_editor_instance) {
+			const canvas = document.getElementById('bin-editor-canvas');
+			bin_editor_instance = new Grid_Setup(canvas);
+			bin_editor_instance.set_rows(1);
+			bin_editor_instance.set_cols(1);
+			bin_editor_instance.load_image(`/img/${bin.source_id}`).then(() => {
+				if (bin.corners) {
+					bin_editor_instance.set_corners(bin.corners);
+				}
+			});
+		}
+	}
+
+	if (bin.image_filename) {
+		preview_img.src = `/img/${bin.image_filename}`;
+		preview_img.hidden = false;
+		no_image_el.hidden = true;
+	} else {
+		preview_img.hidden = true;
+		no_image_el.hidden = false;
+	}
+
+	document.getElementById('bin-editor-go-corners').onclick = () => {
+		dlg.showModal();  // already open; ensures layout is stable before canvas sizes
+		show_corners_view();
+	};
+	document.getElementById('bin-editor-go-back').onclick = show_image_view;
+
+	show_image_view();
+
+	// Tabs: Fields | Contents
+	const tab_panels = {
+		fields:   document.getElementById('bin-editor-tab-fields'),
+		contents: document.getElementById('bin-editor-tab-contents'),
+	};
+	qs(dlg, '#bin-editor-tabs').onclick = (e) => {
+		const tab = e.target.dataset.tab;
+		if (!tab) return;
+		qs(dlg, '#bin-editor-tabs').querySelectorAll('.tab-btn').forEach(btn => {
+			btn.classList.toggle('active', btn.dataset.tab === tab);
+		});
+		for (const [name, el] of Object.entries(tab_panels)) {
+			el.hidden = name !== tab;
+		}
+	};
+
+	// Fields
+	bin_editor_get_fields = build_field_editor(
+		document.getElementById('bin-field-rows'),
+		document.getElementById('bin-add-field-select'),
+		document.getElementById('bin-new-field'),
+		bin.fields ?? {}
+	).get_fields;
+
+	// Contents
+	render_bin_contents(bin.id, document.getElementById('bin-contents-list'));
+	document.getElementById('bin-add-content').onclick = () => open_bin_content_dialog(bin.id);
+
+	dlg.showModal();
+}
+
 // ---------------------------------------------------------------------------
 // Routing
 // ---------------------------------------------------------------------------
@@ -1919,6 +2474,7 @@ function parse_url() {
 	section = 'components';
 	grid_view_state = 'list';
 	grid_tab = 'grids';
+	bin_tab = 'bins';
 	current_grid_id = null;
 	current_panel_idx = null;
 	grid_draft = null;
@@ -1941,6 +2497,11 @@ function parse_url() {
 		section = 'fields';
 	} else if (p0 === 'templates') {
 		section = 'templates';
+	} else if (p0 === 'images') {
+		section = 'images';
+	} else if (p0 === 'bins') {
+		section = 'bins';
+		bin_tab = p1 === 'sources' ? 'sources' : p1 === 'types' ? 'types' : 'bins';
 	} else if (p0 === 'grids') {
 		section = 'grids';
 		if (p1 === 'sources') {
@@ -2021,6 +2582,8 @@ function render() {
 	else if (section === 'fields') render_fields();
 	else if (section === 'grids') render_grids();
 	else if (section === 'templates') render_templates();
+	else if (section === 'bins') render_bins();
+	else if (section === 'images') render_images_section();
 }
 
 // ---------------------------------------------------------------------------
@@ -2031,7 +2594,7 @@ async function init() {
 	const html = await fetch('/templates.html').then(r => r.text());
 	document.body.insertAdjacentHTML('beforeend', html);
 
-	for (const id of ['t-dialog-component', 't-dialog-inventory', 't-dialog-field', 't-dialog-confirm', 't-dialog-file-picker']) {
+	for (const id of ['t-dialog-component', 't-dialog-inventory', 't-dialog-field', 't-dialog-confirm', 't-dialog-file-picker', 't-dialog-bin-editor', 't-dialog-bin-type', 't-dialog-bin-content']) {
 		document.body.appendChild(document.getElementById(id).content.cloneNode(true));
 	}
 
@@ -2122,6 +2685,64 @@ async function init() {
 		document.getElementById('dialog-confirm').close();
 	});
 
+	document.getElementById('bin-editor-cancel').addEventListener('click', () => {
+		document.getElementById('dialog-bin-editor').close();
+		bin_editor_instance = null;
+		bin_editor_bin_id = null;
+	});
+
+	document.getElementById('bt-cancel').addEventListener('click', () => {
+		document.getElementById('dialog-bin-type').close();
+	});
+	document.getElementById('bt-save').addEventListener('click', async () => {
+		try {
+			await bin_type_dialog_callback?.();
+			document.getElementById('dialog-bin-type').close();
+		} catch (err) {
+			alert(err.message);
+		}
+	});
+
+	document.getElementById('bin-editor-save').addEventListener('click', async () => {
+		const id = bin_editor_bin_id;
+		const name = document.getElementById('bin-editor-name').value.trim() || 'Bin';
+		const type_id = document.getElementById('bin-editor-type').value || null;
+		const fields = bin_editor_get_fields?.() ?? {};
+		try {
+			const corners = bin_editor_instance?.get_corners();
+			if (corners) {
+				// Canvas was opened — re-process corners too
+				const phys_w = parseFloat(document.getElementById('bin-editor-width').value) || null;
+				const phys_h = parseFloat(document.getElementById('bin-editor-height').value) || null;
+				await api.update_bin(id, { name, type_id, fields });
+				const r = await api.update_bin_corners(id, corners, phys_w, phys_h);
+				all_bins = all_bins.map(b => b.id === id ? r.bin : b);
+			} else {
+				const r = await api.update_bin(id, { name, type_id, fields });
+				all_bins = all_bins.map(b => b.id === id ? r.bin : b);
+			}
+			document.getElementById('dialog-bin-editor').close();
+			bin_editor_instance = null;
+			bin_editor_bin_id = null;
+			bin_editor_get_fields = null;
+			render_bins();
+		} catch (err) {
+			alert(err.message);
+		}
+	});
+
+	document.getElementById('bc-cancel').addEventListener('click', () => {
+		document.getElementById('dialog-bin-content').close();
+	});
+	document.getElementById('bc-save').addEventListener('click', async () => {
+		try {
+			await bin_content_dialog_callback?.();
+			document.getElementById('dialog-bin-content').close();
+		} catch (err) {
+			alert(err.message);
+		}
+	});
+
 	document.querySelectorAll('.nav-btn').forEach(btn => {
 		btn.addEventListener('click', () => navigate('/' + btn.dataset.section));
 	});
@@ -2158,6 +2779,25 @@ async function init() {
 		}
 	});
 
+	document.getElementById('maint-purge-sources').addEventListener('click', async () => {
+		maint_dropdown.hidden = true;
+		maint_toggle.textContent = '⏳';
+		maint_toggle.disabled = true;
+		try {
+			const result = await api.maintenance_purge_missing_sources();
+			if (result.removed.length > 0) {
+				all_sources = all_sources.filter(s => !result.removed.includes(s.id));
+				render();
+			}
+			alert(`Removed ${result.removed.length} orphaned entr${result.removed.length === 1 ? 'y' : 'ies'} of ${result.total} checked.`);
+		} catch (err) {
+			alert(`Error: ${err.message}`);
+		} finally {
+			maint_toggle.textContent = '⚙';
+			maint_toggle.disabled = false;
+		}
+	});
+
 	window.addEventListener('popstate', () => { parse_url(); render(); });
 
 	await load_all();

public/index.html

@@ -16,11 +16,14 @@
 			<button class="nav-btn" data-section="fields">Fields</button>
 			<button class="nav-btn" data-section="grids">Grids</button>
 			<button class="nav-btn" data-section="templates">Templates</button>
+			<button class="nav-btn" data-section="bins">Bins</button>
+			<button class="nav-btn" data-section="images">Images</button>
 		</nav>
 		<div class="maint-menu" id="maint-menu">
 			<button class="maint-toggle" id="maint-toggle" title="Maintenance">⚙</button>
 			<div class="maint-dropdown" id="maint-dropdown" hidden>
 				<button class="maint-item" id="maint-gen-thumbs">Generate missing PDF thumbnails</button>
+				<button class="maint-item" id="maint-purge-sources">Remove orphaned source image entries</button>
 			</div>
 		</div>
 	</header>

public/lib/api.mjs

@@ -35,8 +35,9 @@ export const update_grid_draft  = (id, body) => req('PUT', `/api/grid-drafts/${i
 export const delete_grid_draft  = (id) => req('DELETE', `/api/grid-drafts/${id}`);
 
 // Source images
-export const get_source_images   = () => req('GET', '/api/source-images');
+export const get_source_images        = () => req('GET', '/api/source-images');
-export const delete_source_image = (id) => req('DELETE', `/api/source-images/${id}`);
+export const update_source_image_uses = (id, uses) => req('PUT', `/api/source-images/${id}`, { uses });
+export const delete_source_image      = (id) => req('DELETE', `/api/source-images/${id}`);
 
 // Component templates
 export const get_component_templates    = () => req('GET', '/api/component-templates');
@@ -60,8 +61,36 @@ export async function upload_pdf(file, display_name, filename) {
 	return data;
 }
 
+// Bin types
+export const get_bin_types    = () => req('GET', '/api/bin-types');
+export const create_bin_type  = (body) => req('POST', '/api/bin-types', body);
+export const update_bin_type  = (id, body) => req('PUT', `/api/bin-types/${id}`, body);
+export const delete_bin_type  = (id) => req('DELETE', `/api/bin-types/${id}`);
+
+// Bins
+export const get_bins            = () => req('GET', '/api/bins');
+export const create_bin_from_source = (source_id, name) => req('POST', '/api/bins/from-source', { source_id, name });
+export const get_bin         = (id) => req('GET', `/api/bins/${id}`);
+export const update_bin      = (id, body) => req('PUT', `/api/bins/${id}`, body);
+export const update_bin_corners = (id, corners, phys_w, phys_h) => req('PUT', `/api/bins/${id}/corners`, { corners, phys_w, phys_h });
+export const add_bin_content    = (id, body) => req('POST',   `/api/bins/${id}/contents`, body);
+export const update_bin_content = (id, cid, body) => req('PUT', `/api/bins/${id}/contents/${cid}`, body);
+export const delete_bin_content = (id, cid) => req('DELETE',  `/api/bins/${id}/contents/${cid}`);
+export const delete_bin      = (id) => req('DELETE', `/api/bins/${id}`);
+
+export async function upload_bin(file, name) {
+	const form = new FormData();
+	form.append('image', file);
+	if (name) form.append('name', name);
+	const res = await fetch('/api/bins', { method: 'POST', body: form });
+	const data = await res.json();
+	if (!data.ok) throw new Error(data.error ?? 'Upload failed');
+	return data;
+}
+
 // Maintenance
-export const maintenance_pdf_thumbs = () => req('POST', '/api/maintenance/pdf-thumbs');
+export const maintenance_pdf_thumbs        = () => req('POST', '/api/maintenance/pdf-thumbs');
+export const maintenance_purge_missing_sources = () => req('POST', '/api/maintenance/purge-missing-sources');
 
 // Grid images
 export const get_grids        = () => req('GET', '/api/grid-images');

public/style.css

@@ -1085,12 +1085,49 @@ nav {
 	box-shadow: 0 0 0 3px rgba(91, 156, 246, 0.3);
 }
 
+.source-card-create-bin {
+	width: 100%;
+}
+
+.source-card-footer {
+	display: flex;
+	align-items: center;
+	justify-content: space-between;
+	gap: 0.25rem;
+}
+
 .source-card-meta {
 	font-size: 0.75rem;
 	color: var(--text-faint);
 	overflow: hidden;
 	text-overflow: ellipsis;
 	white-space: nowrap;
+	flex: 1;
+}
+
+.source-card-uses {
+	display: flex;
+	gap: 0.2rem;
+	flex-shrink: 0;
+}
+
+.source-use-badge {
+	font-size: 0.65rem;
+	padding: 0.1rem 0.35rem;
+	border-radius: 3px;
+	text-transform: lowercase;
+	font-weight: 600;
+	letter-spacing: 0.02em;
+}
+
+.source-use-grid {
+	background: rgba(91, 156, 246, 0.18);
+	color: #5b9cf6;
+}
+
+.source-use-bin {
+	background: rgba(91, 246, 156, 0.18);
+	color: #5bf69c;
 }
 
 .source-card-delete {
@@ -1806,3 +1843,266 @@ nav {
 .detail-file-link:hover {
 	text-decoration: underline;
 }
+
+/* ===== IMAGES ADMIN ===== */
+
+.img-admin-list {
+	display: flex;
+	flex-direction: column;
+	gap: 0;
+}
+
+.img-admin-row {
+	display: flex;
+	align-items: center;
+	gap: 0.75rem;
+	padding: 0.5rem 0;
+	border-bottom: 1px solid var(--border);
+}
+
+.img-admin-thumb-link {
+	flex-shrink: 0;
+}
+
+.img-admin-thumb {
+	width: 80px;
+	height: 56px;
+	object-fit: cover;
+	border-radius: 3px;
+	display: block;
+}
+
+.img-admin-info {
+	flex: 1;
+	min-width: 0;
+	display: flex;
+	flex-direction: column;
+	gap: 0.2rem;
+}
+
+.img-admin-name {
+	font-size: 0.9rem;
+	overflow: hidden;
+	text-overflow: ellipsis;
+	white-space: nowrap;
+}
+
+.img-admin-meta {
+	font-size: 0.75rem;
+	color: var(--text-faint);
+}
+
+.img-admin-uses {
+	display: flex;
+	gap: 0.75rem;
+}
+
+.img-admin-use-label {
+	font-size: 0.8rem;
+	color: var(--text-muted);
+	cursor: pointer;
+	display: flex;
+	align-items: center;
+	gap: 0.25rem;
+}
+
+/* ===== BINS ===== */
+
+.bin-gallery {
+	display: flex;
+	flex-wrap: wrap;
+	gap: 1rem;
+	padding: 1rem 0;
+}
+
+.bin-card {
+	width: 220px;
+	background: var(--surface);
+	border: 1px solid var(--border);
+	border-radius: 6px;
+	overflow: hidden;
+	display: flex;
+	flex-direction: column;
+}
+
+.bin-card-img-wrap {
+	width: 100%;
+	aspect-ratio: 4 / 3;
+	background: #1a1a1a;
+	position: relative;
+	overflow: hidden;
+}
+
+.bin-card-img {
+	width: 100%;
+	height: 100%;
+	object-fit: contain;
+	display: block;
+}
+
+.bin-card-unprocessed {
+	position: absolute;
+	inset: 0;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	font-size: 0.75rem;
+	color: var(--text-muted);
+	background: rgba(0,0,0,0.5);
+}
+
+.bin-card-img-wrap.has-image .bin-card-unprocessed {
+	display: none;
+}
+
+.bin-card-footer {
+	display: flex;
+	align-items: center;
+	justify-content: space-between;
+	padding: 0.4rem 0.5rem;
+	gap: 0.5rem;
+	min-height: 2rem;
+}
+
+.bin-card-name {
+	font-size: 0.85rem;
+	overflow: hidden;
+	text-overflow: ellipsis;
+	white-space: nowrap;
+	flex: 1;
+}
+
+.bin-editor-dims {
+	display: flex;
+	align-items: center;
+	gap: 0.4rem;
+}
+
+.bin-editor-dims input {
+	width: 5rem;
+}
+
+.form-hint {
+	font-size: 0.78rem;
+	color: var(--text-faint);
+	margin-left: 0.25rem;
+}
+
+.bin-editor-preview-wrap {
+	width: 100%;
+	background: #0e0e0e;
+	border-radius: 4px;
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	min-height: 120px;
+	margin-bottom: 0.5rem;
+	overflow: hidden;
+}
+
+.bin-editor-preview-img {
+	max-width: 100%;
+	max-height: 55vh;
+	display: block;
+	object-fit: contain;
+}
+
+.bin-editor-no-image {
+	color: var(--text-faint);
+	font-size: 0.85rem;
+	padding: 2rem;
+	text-align: center;
+}
+
+.btn-link {
+	background: none;
+	border: none;
+	color: var(--text-muted);
+	cursor: pointer;
+	font-size: 0.8rem;
+	padding: 0.25rem 0;
+	text-decoration: underline;
+}
+
+.btn-link:hover {
+	color: var(--text);
+}
+
+.bin-editor-canvas {
+	display: block;
+	border-radius: 4px;
+	max-width: 100%;
+}
+
+.bin-types-list {
+	display: flex;
+	flex-direction: column;
+}
+
+.bin-type-row {
+	display: flex;
+	align-items: center;
+	justify-content: space-between;
+	padding: 0.5rem 0;
+	border-bottom: 1px solid var(--border);
+	gap: 1rem;
+}
+
+.bin-type-info {
+	display: flex;
+	align-items: baseline;
+	gap: 0.75rem;
+	flex: 1;
+	min-width: 0;
+}
+
+.bin-type-name {
+	font-weight: 500;
+}
+
+.bin-type-dims {
+	font-size: 0.8rem;
+	color: var(--text-muted);
+	flex-shrink: 0;
+}
+
+.bin-type-desc {
+	font-size: 0.8rem;
+	color: var(--text-faint);
+	overflow: hidden;
+	text-overflow: ellipsis;
+	white-space: nowrap;
+}
+
+.bin-content-row {
+	display: flex;
+	align-items: center;
+	gap: 0.75rem;
+	padding: 0.4rem 0;
+	border-bottom: 1px solid var(--border);
+}
+
+.bin-content-name {
+	flex: 1;
+	font-weight: 500;
+	min-width: 0;
+	overflow: hidden;
+	text-overflow: ellipsis;
+	white-space: nowrap;
+}
+
+.bin-content-qty {
+	font-size: 0.85rem;
+	color: var(--text-muted);
+	flex-shrink: 0;
+}
+
+.bin-content-notes {
+	font-size: 0.8rem;
+	color: var(--text-faint);
+	flex: 1;
+	min-width: 0;
+	overflow: hidden;
+	text-overflow: ellipsis;
+	white-space: nowrap;
+}

public/templates.html

@@ -248,6 +248,27 @@
 	<div class="empty-state"></div>
 </template>
 
+<!-- ===== IMAGES SECTION ===== -->
+<template id="t-section-images">
+	<section class="section" id="section-images">
+		<div class="img-admin-list" id="img-admin-list"></div>
+	</section>
+</template>
+
+<template id="t-img-admin-row">
+	<div class="img-admin-row">
+		<a class="img-admin-thumb-link" target="_blank" rel="noopener">
+			<img class="img-admin-thumb" alt="">
+		</a>
+		<div class="img-admin-info">
+			<div class="img-admin-name"></div>
+			<div class="img-admin-meta"></div>
+			<div class="img-admin-uses"></div>
+		</div>
+		<button type="button" class="btn-icon btn-danger img-admin-delete" title="Delete">✕</button>
+	</div>
+</template>
+
 <!-- ===== GRIDS SECTION ===== -->
 <template id="t-section-grids">
 	<section class="section" id="section-grids">
@@ -276,7 +297,11 @@
 		<a class="source-card-link" target="_blank" rel="noopener">
 			<img class="source-card-img" alt="">
 		</a>
-		<div class="source-card-meta"></div>
+		<div class="source-card-footer">
+			<div class="source-card-meta"></div>
+			<div class="source-card-uses"></div>
+		</div>
+		<button type="button" class="btn btn-secondary btn-sm source-card-create-bin" hidden>+ Bin</button>
 		<button type="button" class="btn-icon btn-danger source-card-delete" title="Delete">✕</button>
 	</div>
 </template>
@@ -585,6 +610,220 @@
 	</dialog>
 </template>
 
+<!-- ===== BINS SECTION ===== -->
+<template id="t-section-bins">
+	<section class="section" id="section-bins">
+		<div class="section-toolbar">
+			<div class="tab-bar">
+				<button class="tab-btn" id="btn-tab-bins">Bins</button>
+				<button class="tab-btn" id="btn-tab-bin-sources">Source images</button>
+				<button class="tab-btn" id="btn-tab-bin-types">Types</button>
+			</div>
+			<label class="btn btn-secondary" id="btn-upload-bin-sources" hidden>
+				+ Upload
+				<input type="file" accept="image/*" multiple hidden id="bin-source-upload-input">
+			</label>
+			<button class="btn btn-primary" id="btn-add-bin-type" hidden>+ Add type</button>
+		</div>
+		<div id="tab-bins-content">
+			<div class="bin-gallery" id="bin-gallery"></div>
+		</div>
+		<div id="tab-bin-sources-content" hidden>
+			<div id="bin-source-image-list" class="source-gallery"></div>
+		</div>
+		<div id="tab-bin-types-content" hidden>
+			<div id="bin-types-list" class="bin-types-list"></div>
+		</div>
+	</section>
+</template>
+
+<template id="t-bin-type-row">
+	<div class="bin-type-row">
+		<div class="bin-type-info">
+			<span class="bin-type-name"></span>
+			<span class="bin-type-dims"></span>
+			<span class="bin-type-desc"></span>
+		</div>
+		<span class="row-actions">
+			<button class="btn-icon btn-edit" title="Edit">✎</button>
+			<button class="btn-icon btn-danger btn-delete" title="Delete">✕</button>
+		</span>
+	</div>
+</template>
+
+<template id="t-bin-card">
+	<div class="bin-card">
+		<div class="bin-card-img-wrap">
+			<img class="bin-card-img" alt="">
+			<div class="bin-card-unprocessed">Not processed</div>
+		</div>
+		<div class="bin-card-footer">
+			<span class="bin-card-name"></span>
+			<span class="row-actions">
+				<button class="btn-icon btn-edit" title="Edit corners">✎</button>
+				<button class="btn-icon btn-danger btn-delete" title="Delete">✕</button>
+			</span>
+		</div>
+	</div>
+</template>
+
+<!-- ===== DIALOG: BIN EDITOR ===== -->
+<template id="t-dialog-bin-editor">
+	<dialog id="dialog-bin-editor" class="app-dialog app-dialog-wide">
+		<h2 class="dialog-title">Edit bin</h2>
+
+		<div class="form-row">
+			<label>Name</label>
+			<input type="text" id="bin-editor-name" autocomplete="off">
+		</div>
+		<div class="form-row">
+			<label>Type</label>
+			<select id="bin-editor-type">
+				<option value="">— Custom —</option>
+			</select>
+		</div>
+
+		<!-- Default view: processed image -->
+		<div id="bin-editor-view-image">
+			<div class="bin-editor-preview-wrap">
+				<img id="bin-editor-preview" class="bin-editor-preview-img" alt="" hidden>
+				<div id="bin-editor-no-image" class="bin-editor-no-image">Not yet processed — click "Adjust corners" to set up</div>
+			</div>
+			<button type="button" class="btn btn-secondary btn-sm" id="bin-editor-go-corners">Adjust corners…</button>
+		</div>
+
+		<!-- Corners canvas (revealed on demand) -->
+		<div id="bin-editor-view-corners" hidden>
+			<div class="form-row" id="bin-editor-dims-row">
+				<label>Dimensions (mm)</label>
+				<div class="bin-editor-dims">
+					<input type="number" id="bin-editor-width" placeholder="W" min="1" step="1">
+					<span>×</span>
+					<input type="number" id="bin-editor-height" placeholder="H" min="1" step="1">
+					<span class="form-hint">Leave blank to infer from corners</span>
+				</div>
+			</div>
+			<canvas id="bin-editor-canvas" class="bin-editor-canvas"></canvas>
+			<button type="button" class="btn btn-link btn-sm" id="bin-editor-go-back">← Back to image</button>
+		</div>
+
+		<!-- Tabs: Fields | Contents -->
+		<div class="tab-bar" id="bin-editor-tabs">
+			<button class="tab-btn active" data-tab="fields">Fields</button>
+			<button class="tab-btn" data-tab="contents">Contents</button>
+		</div>
+
+		<div id="bin-editor-tab-fields">
+			<div id="bin-field-rows"></div>
+			<div class="form-row add-field-row">
+				<div class="input-with-action">
+					<select id="bin-add-field-select" class="filter-select">
+						<option value="">— add a field —</option>
+					</select>
+					<button type="button" class="btn btn-secondary btn-sm" id="bin-new-field">New…</button>
+				</div>
+			</div>
+		</div>
+
+		<div id="bin-editor-tab-contents" hidden>
+			<div id="bin-contents-list"></div>
+			<div class="form-row" style="margin-top:0.5rem">
+				<button type="button" class="btn btn-secondary btn-sm" id="bin-add-content">+ Add item</button>
+			</div>
+		</div>
+
+		<div class="dialog-actions">
+			<button type="button" class="btn btn-secondary" id="bin-editor-cancel">Cancel</button>
+			<button type="button" class="btn btn-primary" id="bin-editor-save">Save</button>
+		</div>
+	</dialog>
+</template>
+
+<!-- ===== TEMPLATE: BIN CONTENT ROW ===== -->
+<template id="t-bin-content-row">
+	<div class="bin-content-row">
+		<span class="bin-content-name"></span>
+		<span class="bin-content-qty"></span>
+		<span class="bin-content-notes"></span>
+		<span class="row-actions">
+			<button class="btn-icon btn-edit" title="Edit">✎</button>
+			<button class="btn-icon btn-danger btn-delete" title="Remove">✕</button>
+		</span>
+	</div>
+</template>
+
+<!-- ===== DIALOG: BIN CONTENT ITEM ===== -->
+<template id="t-dialog-bin-content">
+	<dialog id="dialog-bin-content" class="app-dialog">
+		<h2 class="dialog-title">Add item</h2>
+		<div class="form-row">
+			<label>Type</label>
+			<select id="bc-type" class="filter-select wide">
+				<option value="component">Component</option>
+				<option value="item">Free text</option>
+			</select>
+		</div>
+		<div class="form-row" id="bc-component-row">
+			<label>Component</label>
+			<select id="bc-component" class="filter-select wide">
+				<option value="">— select —</option>
+			</select>
+		</div>
+		<div class="form-row" id="bc-name-row" hidden>
+			<label>Name</label>
+			<input type="text" id="bc-name" autocomplete="off">
+		</div>
+		<div class="form-row">
+			<label>Quantity</label>
+			<input type="text" id="bc-quantity" autocomplete="off" placeholder="e.g. 10, ~50, full">
+		</div>
+		<div class="form-row">
+			<label>Notes</label>
+			<input type="text" id="bc-notes" autocomplete="off" placeholder="Optional">
+		</div>
+		<div class="dialog-actions">
+			<button type="button" class="btn btn-secondary" id="bc-cancel">Cancel</button>
+			<button type="button" class="btn btn-primary" id="bc-save">Save</button>
+		</div>
+	</dialog>
+</template>
+
+<template id="t-dialog-bin-type">
+	<dialog id="dialog-bin-type" class="app-dialog">
+		<h2 class="dialog-title"></h2>
+		<div class="form-row">
+			<label>Name</label>
+			<input type="text" id="bt-name" autocomplete="off" placeholder="e.g. Sortimo L-Boxx small">
+		</div>
+		<div class="form-row">
+			<label>Dimensions (mm)</label>
+			<div class="bin-editor-dims">
+				<input type="number" id="bt-width" placeholder="W" min="1" step="1">
+				<span>×</span>
+				<input type="number" id="bt-height" placeholder="H" min="1" step="1">
+			</div>
+		</div>
+		<div class="form-row">
+			<label>Description</label>
+			<input type="text" id="bt-description" autocomplete="off" placeholder="Optional">
+		</div>
+		<div class="form-section-label">Field values</div>
+		<div id="bt-field-rows"></div>
+		<div class="form-row add-field-row">
+			<div class="input-with-action">
+				<select id="bt-add-field-select" class="filter-select">
+					<option value="">— add a field —</option>
+				</select>
+				<button type="button" class="btn btn-secondary btn-sm" id="bt-new-field">New…</button>
+			</div>
+		</div>
+		<div class="dialog-actions">
+			<button type="button" class="btn btn-secondary" id="bt-cancel">Cancel</button>
+			<button type="button" class="btn btn-primary" id="bt-save">Save</button>
+		</div>
+	</dialog>
+</template>
+
 <!-- ===== CELL INVENTORY OVERLAY ===== -->
 <template id="t-cell-inventory">
 	<div class="cell-inventory-overlay" id="cell-inventory-overlay">

public/views/grid-setup.mjs

@@ -14,18 +14,22 @@ export class Grid_Setup {
 	#cam_z = 1;
 
 	#corners = null;   // in IMAGE coordinates
-	#drag_idx = -1;    // index of corner being dragged, or -1
+	#drag_idx = -1;    // 0-3: corners, 4-7: edge midpoints (top,right,bottom,left)
+	#drag_prev_img = null;  // previous image-space position for midpoint delta tracking
 	#panning = false;
 	#pan_last = { x: 0, y: 0 };
 
 	#rows = 4;
 	#cols = 6;
 
+	// Edge pairs for midpoint handles: midpoint (idx-4) moves corners [a, b]
+	static #MIDPOINT_EDGES = [[0,1],[1,2],[2,3],[3,0]];
+
 	constructor(canvas_el) {
 		this.#canvas = canvas_el;
 		this.#ctx = canvas_el.getContext('2d');
 
-		canvas_el.addEventListener('mousedown',  e => this.#on_down(e));
+		canvas_el.addEventListener('mousedown',  e => { e.preventDefault(); this.#on_down(e); });
 		canvas_el.addEventListener('mousemove',  e => this.#on_move(e));
 		canvas_el.addEventListener('mouseup',    e => this.#on_up(e));
 		canvas_el.addEventListener('mouseleave', () => { this.#drag_idx = -1; this.#panning = false; });
@@ -41,32 +45,37 @@ export class Grid_Setup {
 			const img = new Image();
 			img.onload = () => {
 				this.#img = img;
-				const max_w = this.#canvas.parentElement.clientWidth || 800;
-				const max_h = Math.floor(window.innerHeight * 0.65);
 
-				// Canvas fills the available space
+				// Let CSS determine the width, then read back the actual rendered value.
-				this.#css_w = max_w;
+				// Using parentElement.clientWidth directly would include the parent's
-				this.#css_h = max_h;
+				// padding, causing css_w to exceed the real content area and making
+				// getBoundingClientRect() return a different width than css_w.
+				this.#canvas.style.width = '100%';
+				const css_w = this.#canvas.getBoundingClientRect().width || 800;
+				const css_h = Math.floor(window.innerHeight * 0.65);
+
+				this.#css_w = css_w;
+				this.#css_h = css_h;
 
 				// Scale: fit image within canvas with slight padding
 				this.#scale = Math.min(
-					(max_w * 0.9) / img.width,
+					(css_w * 0.9) / img.width,
-					(max_h * 0.9) / img.height,
+					(css_h * 0.9) / img.height,
 				);
 
 				const dpr = window.devicePixelRatio || 1;
-				this.#canvas.width  = this.#css_w * dpr;
+				this.#canvas.width  = css_w * dpr;
-				this.#canvas.height = this.#css_h * dpr;
+				this.#canvas.height = css_h * dpr;
-				this.#canvas.style.width  = this.#css_w + 'px';
+				this.#canvas.style.width  = css_w + 'px';
-				this.#canvas.style.height = this.#css_h + 'px';
+				this.#canvas.style.height = css_h + 'px';
 				this.#ctx.scale(dpr, dpr);
 
 				// Camera: start centered, image fitted within canvas
 				const img_w = img.width  * this.#scale;
 				const img_h = img.height * this.#scale;
 				this.#cam_z = 1;
-				this.#cam_x = (max_w - img_w) / 2;
+				this.#cam_x = (css_w - img_w) / 2;
-				this.#cam_y = (max_h - img_h) / 2;
+				this.#cam_y = (css_h - img_h) / 2;
 
 				// Default corners: 15% inset in image coords
 				const mx = img.width  * 0.15;
@@ -126,25 +135,45 @@ export class Grid_Setup {
 		return { x: w.x * this.#cam_z + this.#cam_x, y: w.y * this.#cam_z + this.#cam_y };
 	}
 
+	#get_midpoints() {
+		return Grid_Setup.#MIDPOINT_EDGES.map(([a, b]) => ({
+			x: (this.#corners[a].x + this.#corners[b].x) / 2,
+			y: (this.#corners[a].y + this.#corners[b].y) / 2,
+		}));
+	}
+
 	#find_handle(sp, radius = 18) {
 		if (!this.#corners) return -1;
+		// Corners take priority
 		for (let i = 0; i < 4; i++) {
 			const s = this.#img_to_screen(this.#corners[i]);
 			if ((sp.x - s.x)**2 + (sp.y - s.y)**2 < radius**2) return i;
 		}
+		// Midpoints
+		const mids = this.#get_midpoints();
+		for (let i = 0; i < 4; i++) {
+			const s = this.#img_to_screen(mids[i]);
+			if ((sp.x - s.x)**2 + (sp.y - s.y)**2 < (radius * 0.85)**2) return i + 4;
+		}
 		return -1;
 	}
 
 	#on_down(e, is_touch = false) {
 		if (!this.#corners) return;
 		const sp = this.#screen_pos(e);
+		if (!is_touch && e.button === 1) {
+			// Middle button: pan
+			e.preventDefault();
+			this.#panning = true;
+			this.#pan_last = sp;
+			this.#canvas.style.cursor = 'grabbing';
+			return;
+		}
+		if (!is_touch && e.button !== 0) { return; }
 		const hit = this.#find_handle(sp);
 		if (hit !== -1) {
 			this.#drag_idx = hit;
-		} else {
+			this.#drag_prev_img = this.#world_to_img(this.#to_world(sp));
-			this.#panning = true;
-			this.#pan_last = sp;
-			if (!is_touch) this.#canvas.style.cursor = 'grabbing';
 		}
 	}
 
@@ -152,7 +181,27 @@ export class Grid_Setup {
 		const sp = this.#screen_pos(e);
 		if (this.#drag_idx !== -1) {
 			const img_pos = this.#world_to_img(this.#to_world(sp));
-			this.#corners[this.#drag_idx] = img_pos;
+			const dx = img_pos.x - this.#drag_prev_img.x;
+			const dy = img_pos.y - this.#drag_prev_img.y;
+			if (this.#drag_idx < 4) {
+				const i = this.#drag_idx;
+				this.#corners[i] = { x: this.#corners[i].x + dx, y: this.#corners[i].y + dy };
+			} else {
+				const [a, b] = Grid_Setup.#MIDPOINT_EDGES[this.#drag_idx - 4];
+				// Project delta onto the edge's outward normal so the edge can
+				// only be pushed/pulled perpendicular to itself — never sheared.
+				const ex = this.#corners[b].x - this.#corners[a].x;
+				const ey = this.#corners[b].y - this.#corners[a].y;
+				const len = Math.sqrt(ex*ex + ey*ey);
+				if (len > 0) {
+					const nx = -ey / len;
+					const ny =  ex / len;
+					const proj = dx * nx + dy * ny;
+					this.#corners[a] = { x: this.#corners[a].x + nx * proj, y: this.#corners[a].y + ny * proj };
+					this.#corners[b] = { x: this.#corners[b].x + nx * proj, y: this.#corners[b].y + ny * proj };
+				}
+			}
+			this.#drag_prev_img = img_pos;
 			this.#draw();
 		} else if (this.#panning) {
 			this.#cam_x += sp.x - this.#pan_last.x;
@@ -167,6 +216,7 @@ export class Grid_Setup {
 
 	#on_up(e) {
 		this.#drag_idx = -1;
+		this.#drag_prev_img = null;
 		if (this.#panning) {
 			this.#panning = false;
 			const sp = this.#screen_pos(e);
@@ -255,6 +305,19 @@ export class Grid_Setup {
 			ctx.fillText(LABELS[i], pt.x, pt.y);
 		});
 
+		// Midpoint handles — smaller, white with blue stroke
+		const mid_r = 7 / this.#cam_z;
+		const mids = this.#get_midpoints().map(m => this.#img_to_world(m));
+		mids.forEach(pt => {
+			ctx.beginPath();
+			ctx.arc(pt.x, pt.y, mid_r, 0, Math.PI*2);
+			ctx.fillStyle = 'rgba(255,255,255,0.75)';
+			ctx.fill();
+			ctx.strokeStyle = 'rgba(91,156,246,0.9)';
+			ctx.lineWidth = 2 / this.#cam_z;
+			ctx.stroke();
+		});
+
 		ctx.restore();
 	}
 }

server.mjs

@@ -3,12 +3,12 @@ process.on('uncaughtException',  (err)    => { console.error('[uncaughtException
 
 import express from 'express';
 import multer from 'multer';
-import { unlinkSync, mkdirSync } from 'node:fs';
+import { unlinkSync, mkdirSync, existsSync } from 'node:fs';
 import { extname, join } from 'node:path';
 import { execFileSync } from 'node:child_process';
 import sharp from 'sharp';
 import { generate_id } from './lib/ids.mjs';
-import { compute_cell_size, process_grid_image } from './lib/grid-image.mjs';
+import { compute_cell_size, compute_bin_size, process_grid_image } from './lib/grid-image.mjs';
 import {
 	list_fields, get_field, set_field, delete_field,
 	list_components, get_component, set_component, delete_component,
@@ -18,11 +18,36 @@ import {
 	list_grid_images, get_grid_image, set_grid_image, delete_grid_image,
 	list_component_templates, get_component_template, set_component_template, delete_component_template,
 	list_pdfs, get_pdf, set_pdf, delete_pdf,
+	list_bins, get_bin, set_bin, delete_bin,
+	list_bin_types, get_bin_type, set_bin_type, delete_bin_type,
 } from './lib/storage.mjs';
 
 mkdirSync('./data/images', { recursive: true });
 mkdirSync('./data/pdfs',   { recursive: true });
 
+// Migration: backfill uses[] on existing source images, and register any bin
+// sources that predate the unified gallery.
+(function migrate_source_images() {
+	for (const src of list_source_images()) {
+		if (!src.uses) {
+			add_source_image({ ...src, uses: ['grid'] });
+		}
+	}
+	for (const bin of list_bins()) {
+		if (!get_source_image(bin.source_id)) {
+			// Source image missing from KV — re-register it
+			add_source_image({
+				id: bin.source_id,
+				original_name: '',
+				width: bin.source_w ?? 0,
+				height: bin.source_h ?? 0,
+				uses: ['bin'],
+				created_at: bin.created_at,
+			});
+		}
+	}
+}());
+
 const app = express();
 app.use(express.json());
 app.use('/img', express.static('./data/images'));
@@ -63,6 +88,17 @@ function remove_image_file(img_id) {
 	try { unlinkSync(join('./data/images', img_id)); } catch {}
 }
 
+// Try to rename temp file to the original name; falls back to temp name on collision.
+// Returns the final filename (basename only).
+function settle_image_filename(temp_filename, original_name) {
+	const preferred = original_name || temp_filename;
+	const dest = join('./data/images', preferred);
+	if (rename_no_replace(join('./data/images', temp_filename), dest)) {
+		return preferred;
+	}
+	return temp_filename;
+}
+
 const MV_SYNC = new URL('./tools/mv-sync', import.meta.url).pathname;
 
 // Atomically rename src -> dst, failing if dst already exists.
@@ -328,12 +364,14 @@ app.post('/api/source-images', upload.array('images', 50), async (req, res) => {
 	if (!req.files?.length) return fail(res, 'no files');
 	const added = [];
 	for (const file of req.files) {
-		const meta = await sharp(file.path).metadata();
+		const final_name = settle_image_filename(file.filename, file.originalname);
+		const meta = await sharp(join('./data/images', final_name)).metadata();
 		const src = {
-			id: file.filename,
+			id: final_name,
 			original_name: file.originalname,
 			width: meta.width,
 			height: meta.height,
+			uses: ['grid'],
 			created_at: Date.now(),
 		};
 		add_source_image(src);
@@ -342,15 +380,26 @@ app.post('/api/source-images', upload.array('images', 50), async (req, res) => {
 	ok(res, { sources: added });
 });
 
+app.put('/api/source-images/:id', (req, res) => {
+	const src = get_source_image(req.params.id);
+	if (!src) return fail(res, 'not found', 404);
+	const { uses } = req.body;
+	if (!Array.isArray(uses)) return fail(res, 'uses must be an array');
+	const updated = { ...src, uses };
+	add_source_image(updated);
+	ok(res, { source: updated });
+});
+
 app.delete('/api/source-images/:id', (req, res) => {
 	const id = req.params.id;
 	if (!get_source_image(id)) return fail(res, 'not found', 404);
-	const grids = list_grid_images();
+	const in_grid = list_grid_images().find(g =>
-	const in_use = grids.find(g =>
 		g.source_id === id ||
 		(g.panels && g.panels.some(p => p.source_id === id))
 	);
-	if (in_use) return fail(res, `In use by grid "${in_use.name}"`, 409);
+	if (in_grid) return fail(res, `In use by grid "${in_grid.name}"`, 409);
+	const in_bin = list_bins().find(b => b.source_id === id);
+	if (in_bin) return fail(res, `In use by bin "${in_bin.name}"`, 409);
 	remove_image_file(id);
 	delete_source_image(id);
 	ok(res);
@@ -585,6 +634,18 @@ app.delete('/api/pdfs/:id', (req, res) => {
 // Maintenance
 // ---------------------------------------------------------------------------
 
+app.post('/api/maintenance/purge-missing-sources', (req, res) => {
+	const sources = list_source_images();
+	const removed = [];
+	for (const src of sources) {
+		if (!existsSync(join('./data/images', src.id))) {
+			delete_source_image(src.id);
+			removed.push(src.id);
+		}
+	}
+	ok(res, { removed, total: sources.length });
+});
+
 app.post('/api/maintenance/pdf-thumbs', (req, res) => {
 	const pdfs = list_pdfs();
 	let generated = 0;
@@ -600,6 +661,280 @@ app.post('/api/maintenance/pdf-thumbs', (req, res) => {
 	ok(res, { generated, total: pdfs.length });
 });
 
+// ---------------------------------------------------------------------------
+// Bin types
+// ---------------------------------------------------------------------------
+
+app.get('/api/bin-types', (req, res) => {
+	ok(res, { bin_types: list_bin_types() });
+});
+
+app.post('/api/bin-types', (req, res) => {
+	const { name, phys_w, phys_h, description = '', fields = {} } = req.body;
+	if (!name?.trim()) return fail(res, 'name is required');
+	if (!(phys_w > 0)) return fail(res, 'phys_w must be a positive number');
+	if (!(phys_h > 0)) return fail(res, 'phys_h must be a positive number');
+	const bt = {
+		id: generate_id(),
+		name: name.trim(),
+		phys_w: Number(phys_w),
+		phys_h: Number(phys_h),
+		description: description.trim(),
+		fields: typeof fields === 'object' && fields !== null ? fields : {},
+		created_at: Date.now(),
+		updated_at: Date.now(),
+	};
+	set_bin_type(bt);
+	ok(res, { bin_type: bt });
+});
+
+app.put('/api/bin-types/:id', (req, res) => {
+	const existing = get_bin_type(req.params.id);
+	if (!existing) return fail(res, 'not found', 404);
+	const { name, phys_w, phys_h, description, fields } = req.body;
+	const updated = { ...existing, updated_at: Date.now() };
+	if (name !== undefined) updated.name = name.trim();
+	if (phys_w !== undefined) {
+		if (!(Number(phys_w) > 0)) return fail(res, 'phys_w must be a positive number');
+		updated.phys_w = Number(phys_w);
+	}
+	if (phys_h !== undefined) {
+		if (!(Number(phys_h) > 0)) return fail(res, 'phys_h must be a positive number');
+		updated.phys_h = Number(phys_h);
+	}
+	if (description !== undefined) updated.description = description.trim();
+	if (fields !== undefined && typeof fields === 'object' && fields !== null) updated.fields = fields;
+	set_bin_type(updated);
+	ok(res, { bin_type: updated });
+});
+
+app.delete('/api/bin-types/:id', (req, res) => {
+	if (!get_bin_type(req.params.id)) return fail(res, 'not found', 404);
+	const in_use = list_bins().find(b => b.type_id === req.params.id);
+	if (in_use) return fail(res, `In use by bin "${in_use.name}"`, 409);
+	delete_bin_type(req.params.id);
+	ok(res);
+});
+
+// ---------------------------------------------------------------------------
+// Bins
+// ---------------------------------------------------------------------------
+
+app.get('/api/bins', (req, res) => {
+	ok(res, { bins: list_bins() });
+});
+
+app.get('/api/bins/:id', (req, res) => {
+	const bin = get_bin(req.params.id);
+	if (!bin) return fail(res, 'not found', 404);
+	ok(res, { bin });
+});
+
+// Create a bin from an already-uploaded source image
+app.post('/api/bins/from-source', (req, res) => {
+	const { source_id, name = '', type_id = null } = req.body;
+	if (!source_id) return fail(res, 'source_id is required');
+	const src = get_source_image(source_id);
+	if (!src) return fail(res, 'source image not found', 404);
+	if (type_id && !get_bin_type(type_id)) return fail(res, 'bin type not found', 404);
+
+	if (!src.uses?.includes('bin')) {
+		add_source_image({ ...src, uses: [...(src.uses ?? []), 'bin'] });
+	}
+
+	const bt = type_id ? get_bin_type(type_id) : null;
+	const mx = Math.round(src.width  * 0.15);
+	const my = Math.round(src.height * 0.15);
+	const bin = {
+		id: generate_id(),
+		name: name.trim() || src.original_name?.replace(/\.[^.]+$/, '') || 'Bin',
+		type_id,
+		source_id,
+		source_w: src.width,
+		source_h: src.height,
+		corners: [
+			{ x: mx,             y: my              },
+			{ x: src.width - mx, y: my              },
+			{ x: src.width - mx, y: src.height - my },
+			{ x: mx,             y: src.height - my },
+		],
+		phys_w: bt?.phys_w ?? null,
+		phys_h: bt?.phys_h ?? null,
+		image_filename: null,
+		fields: {},
+		contents: [],
+		created_at: Date.now(),
+		updated_at: Date.now(),
+	};
+	set_bin(bin);
+	ok(res, { bin });
+});
+
+// Upload a source image for a bin and create the bin record (no processing yet)
+app.post('/api/bins', upload.single('image'), async (req, res) => {
+	if (!req.file) return fail(res, 'no image uploaded');
+	const { name = '', type_id = null } = req.body;
+	if (type_id && !get_bin_type(type_id)) return fail(res, 'bin type not found', 404);
+	const final_name = settle_image_filename(req.file.filename, req.file.originalname);
+	const meta = await sharp(join('./data/images', final_name)).metadata();
+
+	add_source_image({
+		id: final_name,
+		original_name: req.file.originalname,
+		width: meta.width,
+		height: meta.height,
+		uses: ['bin'],
+		created_at: Date.now(),
+	});
+
+	const bt = type_id ? get_bin_type(type_id) : null;
+	const mx = Math.round(meta.width  * 0.15);
+	const my = Math.round(meta.height * 0.15);
+	const bin = {
+		id: generate_id(),
+		name: name.trim() || 'Bin',
+		type_id,
+		source_id: final_name,
+		source_w: meta.width,
+		source_h: meta.height,
+		corners: [
+			{ x: mx,              y: my               },
+			{ x: meta.width - mx, y: my               },
+			{ x: meta.width - mx, y: meta.height - my },
+			{ x: mx,              y: meta.height - my },
+		],
+		phys_w: bt?.phys_w ?? null,
+		phys_h: bt?.phys_h ?? null,
+		image_filename: null,
+		fields: {},
+		contents: [],
+		created_at: Date.now(),
+		updated_at: Date.now(),
+	};
+	set_bin(bin);
+	ok(res, { bin });
+});
+
+// Update corners (and re-process image)
+app.put('/api/bins/:id/corners', async (req, res) => {
+	const bin = get_bin(req.params.id);
+	if (!bin) return fail(res, 'not found', 404);
+	const { corners, phys_w, phys_h } = req.body;
+	if (!corners || corners.length !== 4) return fail(res, 'corners must be array of 4 points');
+
+	try {
+		if (bin.image_filename) remove_image_file(bin.image_filename);
+
+		const source_path = join('./data/images', bin.source_id);
+		let bin_w, bin_h;
+		if (phys_w > 0 && phys_h > 0) {
+			// Use physical aspect ratio scaled to the same area as computed size
+			const computed = compute_bin_size(corners);
+			const area = computed.bin_w * computed.bin_h;
+			const aspect = phys_w / phys_h;
+			bin_h = Math.round(Math.sqrt(area / aspect));
+			bin_w = Math.round(bin_h * aspect);
+		} else {
+			({ bin_w, bin_h } = compute_bin_size(corners));
+		}
+
+		const cells = await process_grid_image(source_path, corners, 1, 1, bin_w, bin_h, './data/images');
+		const image_filename = cells[0][0];
+
+		const updated = {
+			...bin, corners, image_filename, bin_w, bin_h,
+			phys_w: phys_w > 0 ? phys_w : (bin.phys_w ?? null),
+			phys_h: phys_h > 0 ? phys_h : (bin.phys_h ?? null),
+			updated_at: Date.now(),
+		};
+		set_bin(updated);
+		ok(res, { bin: updated });
+	} catch (err) {
+		console.error(err);
+		fail(res, err.message, 500);
+	}
+});
+
+// Update name / type / fields
+app.put('/api/bins/:id', (req, res) => {
+	const bin = get_bin(req.params.id);
+	if (!bin) return fail(res, 'not found', 404);
+	const { name, type_id, fields } = req.body;
+	if (type_id !== undefined && type_id !== null && !get_bin_type(type_id)) {
+		return fail(res, 'bin type not found', 404);
+	}
+	const updated = { ...bin, updated_at: Date.now() };
+	if (name !== undefined) updated.name = name.trim() || 'Bin';
+	if (type_id !== undefined) {
+		updated.type_id = type_id;
+		const bt = type_id ? get_bin_type(type_id) : null;
+		if (bt) { updated.phys_w = bt.phys_w; updated.phys_h = bt.phys_h; }
+	}
+	if (fields !== undefined && typeof fields === 'object' && fields !== null) updated.fields = fields;
+	set_bin(updated);
+	ok(res, { bin: updated });
+});
+
+// Add a content item to a bin
+app.post('/api/bins/:id/contents', (req, res) => {
+	const bin = get_bin(req.params.id);
+	if (!bin) return fail(res, 'not found', 404);
+	const { type, component_id, name, quantity = '', notes = '' } = req.body;
+	if (type !== 'component' && type !== 'item') return fail(res, 'type must be "component" or "item"');
+	if (type === 'component' && !component_id) return fail(res, 'component_id is required for type component');
+	if (type === 'item' && !name?.trim()) return fail(res, 'name is required for type item');
+	const item = {
+		id: generate_id(),
+		type,
+		component_id: type === 'component' ? component_id : null,
+		name: type === 'item' ? name.trim() : null,
+		quantity: String(quantity).trim(),
+		notes: String(notes).trim(),
+		created_at: Date.now(),
+	};
+	const updated = { ...bin, contents: [...(bin.contents ?? []), item], updated_at: Date.now() };
+	set_bin(updated);
+	ok(res, { bin: updated, item });
+});
+
+// Update a content item
+app.put('/api/bins/:id/contents/:cid', (req, res) => {
+	const bin = get_bin(req.params.id);
+	if (!bin) return fail(res, 'not found', 404);
+	const idx = (bin.contents ?? []).findIndex(c => c.id === req.params.cid);
+	if (idx === -1) return fail(res, 'content item not found', 404);
+	const item = bin.contents[idx];
+	const { quantity, notes, name } = req.body;
+	const updated_item = { ...item };
+	if (quantity !== undefined) updated_item.quantity = String(quantity).trim();
+	if (notes !== undefined) updated_item.notes = String(notes).trim();
+	if (name !== undefined && item.type === 'item') updated_item.name = name.trim();
+	const new_contents = bin.contents.map((c, i) => i === idx ? updated_item : c);
+	const updated = { ...bin, contents: new_contents, updated_at: Date.now() };
+	set_bin(updated);
+	ok(res, { bin: updated, item: updated_item });
+});
+
+// Remove a content item
+app.delete('/api/bins/:id/contents/:cid', (req, res) => {
+	const bin = get_bin(req.params.id);
+	if (!bin) return fail(res, 'not found', 404);
+	const exists = (bin.contents ?? []).some(c => c.id === req.params.cid);
+	if (!exists) return fail(res, 'content item not found', 404);
+	const updated = { ...bin, contents: bin.contents.filter(c => c.id !== req.params.cid), updated_at: Date.now() };
+	set_bin(updated);
+	ok(res);
+});
+
+app.delete('/api/bins/:id', (req, res) => {
+	const bin = get_bin(req.params.id);
+	if (!bin) return fail(res, 'not found', 404);
+	// Only delete the processed output — source image is managed independently
+	if (bin.image_filename) remove_image_file(bin.image_filename);
+	delete_bin(bin.id);
+	ok(res);
+});
+
 // SPA fallback — serve index.html for any non-API, non-asset path
 const INDEX_HTML = new URL('./public/index.html', import.meta.url).pathname;
 app.get('/{*path}', (req, res) => res.sendFile(INDEX_HTML));

ui-structure.md

@@ -0,0 +1,362 @@
+# UI Structure
+
+Current UI inventory — sections, widgets, templates, and recurring patterns.
+Intended as a reference for the rewrite and for defining a higher-level UI
+representation.
+
+---
+
+## Navigation
+
+Top bar with 7 section buttons + a maintenance dropdown (⚙):
+
+| Button | Section | Default? |
+|--------|---------|----------|
+| Components | Split-pane list/detail | ✓ |
+| Inventory | Table |  |
+| Fields | Table |  |
+| Grids | Tabbed (Grids / Source images) + sub-views |  |
+| Templates | Card list |  |
+| Bins | Tabbed (Bins / Source images / Types) |  |
+| Images | Admin list |  |
+
+Maintenance dropdown (not a section):
+- Generate missing PDF thumbnails
+- Remove orphaned source image entries
+
+---
+
+## Sections
+
+### Components
+**Layout:** Resizable split-pane (width persisted in localStorage)
+
+**Left — master list:**
+- Search input (filters by name + field values)
+- Quick-add input (creates component inline)
+- List of `t-component-row` items (name + colored field-value badge tags)
+
+**Right — detail panel:**
+- Placeholder when nothing selected
+- When selected: name, description, Edit / Duplicate / Delete actions
+  - Fields block — name/value rows
+  - Images block — thumbnail gallery + upload button
+  - Files block — linked PDFs + file picker button
+  - Inventory block — location entries (each with edit/delete) + add button
+
+**Dialogs opened from here:** component edit, field create, inventory entry, file
+picker, confirm delete
+
+---
+
+### Inventory
+**Layout:** Toolbar + table
+
+- Filter: text search + location-type dropdown (All / Physical / BOM / Digital / Grid)
+- Table columns: Component | Type | Location/Ref | Qty | Notes | Actions (edit, delete)
+- Component name cells are links → `/components/:id`
+- Grid location cells link to the grid viewer at that cell
+- "+ Add entry" button in toolbar
+
+**Dialogs opened from here:** inventory entry edit/create, confirm delete
+
+---
+
+### Fields
+**Layout:** Toolbar + table
+
+- Table columns: Name | Unit | Description | Actions (edit, delete)
+- "+ Add field" button in toolbar
+
+**Dialogs opened from here:** field edit/create, confirm delete
+
+---
+
+### Templates
+**Layout:** Toolbar + card list
+
+- Cards show: name, formatter JS code (read-only `<pre>`), edit/delete actions
+- "+ Add template" button
+- Live preview panel in the edit dialog
+
+**Dialogs opened from here:** template edit/create, confirm delete
+
+---
+
+### Grids
+**Layout:** Tabbed, plus three full-page sub-views (not dialogs)
+
+**Tab: Grids**
+- Grid cards (image grid preview, name, delete)
+- Draft cards (unprocessed setups, badge "Draft")
+- "+ New grid" button → wizard dialog
+
+**Tab: Source images**
+- Source image gallery (`t-source-card`)
+- "+ Upload" button
+
+**Sub-view: Panel manager** (replaces main content)
+- Editable grid of panel slots — each slot is a photo region
+- Header with grid name, Cancel / Process buttons
+
+**Sub-view: Grid setup** (replaces main content)
+- Canvas corner editor (`Grid_Setup` class) with pan/zoom
+- Right panel: cell size info, action buttons, progress
+
+**Sub-view: Grid viewer** (replaces main content)
+- Full grid of cell thumbnails
+- Click cell → cell inventory overlay (non-modal panel)
+- Header with Edit panels / Delete actions
+
+**Dialogs opened from here:** new grid wizard, source picker, confirm delete
+
+---
+
+### Bins
+**Layout:** Tabbed
+
+**Tab: Bins**
+- Gallery of `t-bin-card` items (processed image or "Not processed" indicator)
+- Click Edit (✎) → bin editor dialog
+
+**Tab: Source images**
+- Filtered source gallery (uses includes 'bin')
+- Each card has a "+ Bin" button to create a bin from that source
+
+**Tab: Types**
+- List of `t-bin-type-row` items (name, dimensions, description)
+- Edit / delete per row
+- "+ Add type" button
+
+**Dialogs opened from here:** bin editor, bin type edit/create, bin content
+add/edit, field create, confirm delete
+
+---
+
+### Images
+**Layout:** Admin list
+
+- One row per source image: thumbnail, filename, dimensions, uses checkboxes
+  (grid / bin, toggleable), delete button
+- Purpose: correct mislabeled source images
+
+---
+
+## Widget Patterns
+
+These are the recurring structural widgets across the app. Listing all instances
+makes the taxonomy visible and suggests what a higher-level UI DSL would need to
+express.
+
+---
+
+### Split pane (master/detail)
+A resizable two-column layout. Left = filterable list. Right = detail view of
+selected item, or a placeholder.
+
+| Instance | Left | Right |
+|----------|------|-------|
+| Components | Component list + search | Detail panel (fields, images, files, inventory) |
+
+Currently only one instance. The pattern is general enough to reuse for grids,
+bins, etc.
+
+---
+
+### Tabbed section
+A tab bar that switches between content panels within the same section. Tab state
+can be reflected in the URL (`/bins/sources`, `/grids/sources`).
+
+| Instance | Tabs |
+|----------|------|
+| Grids section | Grids \| Source images |
+| Bins section | Bins \| Source images \| Types |
+| Bin editor dialog | Fields \| Contents |
+
+---
+
+### Table view
+Toolbar (search/filter + action button) + `<table>` with rows and per-row
+edit/delete icon buttons.
+
+| Instance | Row content |
+|----------|-------------|
+| Inventory | Component, type badge, location ref, qty, notes |
+| Fields | Name, unit, description |
+
+---
+
+### Card gallery
+A wrapping grid of cards. Each card has a visual element (image or preview),
+a title, and action buttons.
+
+| Instance | Card type | Visual |
+|----------|-----------|--------|
+| Grid list | `t-grid-card` | Multi-thumbnail preview |
+| Bin gallery | `t-bin-card` | Processed image or placeholder |
+| Source image gallery | `t-source-card` | Photo thumbnail |
+| Template list | `t-template-card` | Formatter code `<pre>` |
+
+---
+
+### List row with actions
+A horizontal row with info spans on the left and icon buttons on the right. Used
+in data-table rows and standalone list elements.
+
+| Instance | Info shown |
+|----------|------------|
+| Inventory table rows | Component, type, location, qty, notes |
+| Field table rows | Name, unit, description |
+| Bin type rows | Name, dimensions, description |
+| Bin content rows | Name/component, qty, notes |
+| Image admin rows | Thumbnail, filename, dimensions, uses checkboxes |
+
+---
+
+### Field editor (dynamic rows)
+A list of label + text input + remove button rows, plus an "add field" dropdown
+and "New…" button. Shared across component edit, bin edit, and bin type edit via
+`build_field_editor()`.
+
+| Instance | Host |
+|----------|------|
+| Component edit dialog | `#c-field-rows` |
+| Bin editor — Fields tab | `#bin-field-rows` |
+| Bin type dialog | `#bt-field-rows` |
+
+---
+
+### Modal dialog
+`<dialog>` element shown with `.showModal()`. All injected at init from
+`<template>` elements. Closed via Cancel button, form submit, or backdrop click.
+Save callback stored as a module-level variable, called by the registered submit
+handler.
+
+| Dialog | Purpose | Key inputs |
+|--------|---------|------------|
+| `dialog-component` | Create/edit component | Name, description, field editor |
+| `dialog-inventory` | Create/edit inventory entry | Component, type, location, qty, notes, grid picker |
+| `dialog-field` | Create/edit field definition | Name, unit, description |
+| `dialog-template` | Create/edit name formatter | Name, JS code, test data, live preview |
+| `dialog-new-grid` | Grid creation wizard | Name, rows, cols, photo coverage |
+| `dialog-source-picker` | Pick a source image | Upload or select from gallery |
+| `dialog-confirm` | Generic confirm/delete | Dynamic message text |
+| `dialog-file-picker` | Link a PDF to a component | PDF list, upload section |
+| `dialog-bin-editor` | Edit bin (image, corners, fields, contents) | Name, type, image/canvas, tabs |
+| `dialog-bin-type` | Create/edit bin type | Name, dimensions, description, field editor |
+| `dialog-bin-content` | Add/edit bin content item | Type (component/free text), qty, notes |
+
+---
+
+### Non-modal overlay / panel
+Injected into the DOM and shown/hidden with `hidden`. Not a `<dialog>` — does not
+block the rest of the UI.
+
+| Instance | Trigger | Content |
+|----------|---------|---------|
+| Cell inventory overlay | Click grid cell in viewer | Inventory entries for that cell, + add button |
+
+---
+
+### Full-page sub-view (section replacement)
+Replaces the entire `<main>` content. Not a dialog or overlay — the user is
+"inside" a different mode of the same section. Back navigation returns to the
+section list view.
+
+| Instance | Entered from | Content |
+|----------|-------------|---------|
+| Grid setup | New grid wizard → source picker | Canvas corner editor + controls |
+| Panel manager | Grid card or setup → next | Editable panel slot grid |
+| Grid viewer | Grid card click | Cell thumbnail grid, cell inventory overlay |
+
+---
+
+### Canvas editor
+`Grid_Setup` class renders into a `<canvas>`. Handles pan (middle mouse), zoom
+(wheel), and corner/edge handle dragging for perspective correction. Used in two
+places with identical behaviour.
+
+| Instance | Embedded in |
+|----------|-------------|
+| Grid setup sub-view | `t-grid-setup` canvas |
+| Bin corner editor | `dialog-bin-editor` (revealed on "Adjust corners") |
+
+---
+
+### Image lightbox
+Full-screen image overlay triggered by clicking thumbnails. Single global
+instance, not per-section. Clicking anywhere closes it.
+
+---
+
+## Complete Template Inventory
+
+| Template ID | Type | Renders |
+|-------------|------|---------|
+| `t-section-components` | Section | Split-pane container |
+| `t-section-inventory` | Section | Table container |
+| `t-section-fields` | Section | Table container |
+| `t-section-templates` | Section | Card list container |
+| `t-section-grids` | Section | Tabbed container |
+| `t-section-bins` | Section | Tabbed container |
+| `t-section-images` | Section | Admin list container |
+| `t-component-row` | List item | Name + field-value badge tags |
+| `t-field-tag` | Badge | Single field name + value |
+| `t-detail-placeholder` | Placeholder | "Select a component" message |
+| `t-detail-content` | Detail panel | Full component detail |
+| `t-detail-field-row` | Row | Field name + rendered value |
+| `t-detail-inv-entry` | Row | Inventory entry with images sub-gallery |
+| `t-image-thumb` | Thumbnail | Image link + delete button |
+| `t-inventory-row` | Table row | Inventory entry (all columns) |
+| `t-field-row` | Table row | Field definition (all columns) |
+| `t-empty-row` | Table empty | colspan message cell |
+| `t-empty-block` | Block empty | Div with message |
+| `t-template-card` | Card | Template name + code + actions |
+| `t-source-card` | Card | Source image + meta + uses badges |
+| `t-draft-card` | Card | Draft grid + badge + actions |
+| `t-grid-card` | Card | Grid preview thumbs + meta + actions |
+| `t-panel-manager` | Sub-view | Panel slot editor grid |
+| `t-panel-slot` | Grid cell | Slot thumbnail + label |
+| `t-grid-setup` | Sub-view | Canvas + controls |
+| `t-grid-viewer` | Sub-view | Cell thumbnail grid |
+| `t-grid-cell` | Grid cell | Cell image + location label |
+| `t-bin-card` | Card | Bin image or placeholder + actions |
+| `t-bin-type-row` | Row | Bin type info + actions |
+| `t-bin-content-row` | Row | Content item info + actions |
+| `t-img-admin-row` | Row | Source image admin row |
+| `t-dialog-component` | Dialog | Component create/edit |
+| `t-dialog-inventory` | Dialog | Inventory entry create/edit |
+| `t-dialog-field` | Dialog | Field definition create/edit |
+| `t-dialog-template` | Dialog | Template create/edit + preview |
+| `t-dialog-new-grid` | Dialog | Grid creation wizard |
+| `t-dialog-source-picker` | Dialog | Source image selector |
+| `t-dialog-confirm` | Dialog | Generic confirm |
+| `t-dialog-file-picker` | Dialog | PDF picker + upload |
+| `t-dialog-bin-editor` | Dialog | Bin edit (image, corners, fields, contents) |
+| `t-dialog-bin-type` | Dialog | Bin type create/edit |
+| `t-dialog-bin-content` | Dialog | Bin content item create/edit |
+| `t-cell-inventory` | Overlay | Grid cell inventory entries |
+
+---
+
+## Notes for a Higher-Level UI Representation
+
+The widgets above map fairly cleanly onto a small set of primitives that a UI DSL
+would need:
+
+- **Section** — a top-level navigable view, registered in the nav bar
+- **Tabs** — switch between named content panels, state optionally in URL
+- **SplitPane** — resizable master/detail, left = list, right = detail
+- **Table** — toolbar + rows, each row has a schema and action set
+- **Gallery** — wrapping grid of cards, each card has a schema
+- **Row** — horizontal item with info fields and icon actions
+- **FieldEditor** — dynamic key/value input list (add/remove/edit)
+- **Dialog** — modal form with a save callback, injected from a template
+- **Overlay** — non-modal panel, shown/hidden in place
+- **SubView** — full-page mode that replaces main content
+- **Canvas** — bespoke interactive widget (not expressible declaratively)
+- **Lightbox** — global full-screen image viewer
+
+Most sections are composed of 2–3 of these primitives. The Components section
+(SplitPane → Table + Gallery + FieldEditor) is the most complex. The canvas-based
+views are the only things that require imperative escape hatches.