Add bins feature: upload, de-perspective, gallery

- lib/storage.mjs: bin CRUD with bin: prefix
- lib/grid-image.mjs: compute_bin_size() capped at 1024px
- server.mjs: POST/GET/PUT/DELETE /api/bins routes; PUT /api/bins/:id/corners
  re-processes image via process_grid_image with rows=1 cols=1
- public/lib/api.mjs: bin API wrappers including upload_bin()
- public/index.html: Bins nav button
- public/templates.html: t-section-bins, t-bin-card, t-dialog-bin-editor
- public/app.mjs: render_bins(), open_bin_editor() using Grid_Setup,
  save/cancel wiring in init()
- public/style.css: bin gallery and card styles

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

public/templates.html

@@ -276,7 +276,10 @@
 		<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-icon btn-danger source-card-delete" title="Delete">✕</button>
 	</div>
 </template>
@@ -585,6 +588,51 @@
 	</dialog>
 </template>
 
+<!-- ===== BINS SECTION ===== -->
+<template id="t-section-bins">
+	<section class="section" id="section-bins">
+		<div class="section-toolbar">
+			<label class="btn btn-primary">
+				<input type="file" id="bin-upload-input" accept="image/*" hidden>
+				+ Upload bin photo
+			</label>
+		</div>
+		<div class="bin-gallery" id="bin-gallery"></div>
+	</section>
+</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>
+		<canvas id="bin-editor-canvas" class="bin-editor-canvas"></canvas>
+		<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 &amp; process</button>
+		</div>
+	</dialog>
+</template>
+
 <!-- ===== CELL INVENTORY OVERLAY ===== -->
 <template id="t-cell-inventory">
 	<div class="cell-inventory-overlay" id="cell-inventory-overlay">