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/styles/utilities.css

@@ -2053,10 +2053,38 @@ a.nav-item,
 .mobile-list-item-actions {
 	display: flex;
 	align-items: center;
+	gap: var(--space-1);
 	flex-shrink: 0;
 	color: var(--muted);
 }
 
+.mobile-list-item-action {
+	display: flex;
+	align-items: center;
+	justify-content: center;
+	width: 36px;
+	height: 36px;
+	padding: 0;
+	background: transparent;
+	border: 1px solid var(--border);
+	border-radius: 8px;
+	color: var(--muted);
+	cursor: pointer;
+}
+
+.mobile-list-item-action:active {
+	background: var(--bg);
+}
+
+.mobile-list-item-action-delete {
+	color: var(--danger);
+	border-color: var(--danger);
+}
+
+.mobile-list-item-action-delete:active {
+	background: var(--danger-light);
+}
+
 .mobile-list-empty {
 	display: flex;
 	flex-direction: column;
@@ -2196,8 +2224,8 @@ a.nav-item,
 	position: fixed;
 	left: 0;
 	right: 0;
-	bottom: 0;
-	z-index: 20;
+	bottom: 64px;
+	z-index: 110;
 	display: flex;
 	flex-direction: column;
 	gap: var(--space-2);