Add bin types: reusable named dimension presets for bins

Bin types store a name, physical W×H in mm, and optional description.
When editing a bin, a type can be selected from a dropdown; this
pre-fills and locks the dimension inputs. Custom dimensions remain
available when no type is selected.

- lib/storage.mjs: bin type CRUD with bt: prefix
- server.mjs: /api/bin-types CRUD routes; type_id accepted on bin
  create/update routes; DELETE protected if any bin references the type;
  type dims copied onto bin when type_id is set
- public/lib/api.mjs: bin type wrappers; rename_bin → update_bin (accepts
  any fields)
- public/templates.html: Types tab in bins section; t-bin-type-row;
  t-dialog-bin-type; type selector in bin editor dialog
- public/app.mjs: all_bin_types state loaded at startup; render_bin_types_list();
  open_bin_type_dialog(); type selector in open_bin_editor(); /bins/types routing
- public/style.css: bin types list styles

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

public/lib/api.mjs

@@ -61,11 +61,17 @@ 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/${id}`);
-export const rename_bin      = (id, name) => req('PUT', `/api/bins/${id}`, { name });
+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 delete_bin      = (id) => req('DELETE', `/api/bins/${id}`);