feat: restore delete buttons in mobile list views and fix edit action bar

- Wire MobileListView onItemDelete/onItemDuplicate callbacks to render
  action buttons in each list row.
- Pass onItemDelete in ToolWorkshopMobileView list view.
- Add CSS for mobile-list-item-action buttons.
- Fix MobileEditView sticky bottom action bar that was hidden behind
  the 64px mobile navigation bar; raise to bottom: 64px and z-index 110.

Quality gates: npm run typecheck, npm run lint, npm test -- --run (87 passed)

Refs: openspec/changes/mobile-list-delete-button

apps/web/src/components/features/mobile/mobile-list-view.tsx

@@ -24,6 +24,8 @@ interface MobileListViewProps {
 export const MobileListView: React.FC<MobileListViewProps> = ({
 	items,
 	onItemClick,
+	onItemDelete,
+	onItemDuplicate,
 	emptyMessage = "No items found",
 	searchPlaceholder = "Search...",
 	onSearch,
@@ -73,11 +75,38 @@ export const MobileListView: React.FC<MobileListViewProps> = ({
 									)}
 								</div>
 							)}
-							<div
-								className="mobile-list-item-actions"
-								style={{ transform: "rotate(180deg)" }}
-							>
-								<Icon name="arrow-left" size="sm" />
+							<div className="mobile-list-item-actions">
+								{onItemDuplicate && (
+									<button
+										type="button"
+										className="mobile-list-item-action mobile-list-item-action-duplicate"
+										onClick={(e) => {
+											e.stopPropagation();
+											onItemDuplicate(item.id);
+										}}
+										aria-label="Duplicate"
+									>
+										<Icon name="copy" size="sm" />
+									</button>
+								)}
+								{onItemDelete && (
+									<button
+										type="button"
+										className="mobile-list-item-action mobile-list-item-action-delete"
+										onClick={(e) => {
+											e.stopPropagation();
+											onItemDelete(item.id);
+										}}
+										aria-label="Delete"
+									>
+										<Icon name="delete" size="sm" />
+									</button>
+								)}
+								{!onItemDelete && !onItemDuplicate && (
+									<span style={{ transform: "rotate(180deg)" }}>
+										<Icon name="arrow-left" size="sm" />
+									</span>
+								)}
 							</div>
 						</button>
 					))}