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/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>