Fix formatter in inventory component selector; add Duplicate button

- Inventory dialog now uses component_display_name() not c.name
- Duplicate copies name/description/fields and immediately opens edit dialog

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

public/app.mjs

@@ -293,6 +293,18 @@ function render_detail_panel() {
 	set_text(content, '.detail-name', component_display_name(comp));
 	set_text(content, '.detail-description', comp.description || '');
 	qs(content, '.detail-edit-btn').addEventListener('click', () => open_component_dialog(comp));
+	qs(content, '.detail-duplicate-btn').addEventListener('click', async () => {
+		const result = await api.create_component({
+			name: comp.name,
+			description: comp.description,
+			fields: { ...comp.fields },
+		});
+		all_components.push(result.component);
+		all_components.sort((a, b) => a.name.localeCompare(b.name));
+		selected_component_id = result.component.id;
+		render();
+		open_component_dialog(result.component);
+	});
 	qs(content, '.detail-delete-btn').addEventListener('click', () => confirm_delete(
 		`Delete component "${component_display_name(comp)}"? Inventory entries will become orphaned.`,
 		async () => {
@@ -1622,7 +1634,7 @@ function open_inventory_dialog(entry = null, default_component_id = null, defaul
 		Object.assign(document.createElement('option'), { value: '', textContent: '— select component —' }),
 		...all_components.map(c => Object.assign(document.createElement('option'), {
 			value: c.id,
-			textContent: c.name,
+			textContent: component_display_name(c),
 		}))
 	);
 	comp_sel.value = entry?.component_id ?? default_component_id ?? '';

public/templates.html

@@ -37,6 +37,7 @@
 			</div>
 			<div class="detail-header-actions">
 				<button class="btn btn-secondary detail-edit-btn">Edit</button>
+				<button class="btn btn-secondary detail-duplicate-btn">Duplicate</button>
 				<button class="btn btn-danger detail-delete-btn">Delete</button>
 			</div>
 		</div>