feat(22-01): wire catalog search and detail page to collection/thread modals

- Replace handleAddStub with handleAdd dispatching to correct modal by mode
- Global item detail page: add both "Add to Collection" and "Add to Thread" buttons
- Remove console.log stub from detail page
- Import useUIStore in both components

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/client/components/CatalogSearchOverlay.tsx

@@ -97,8 +97,16 @@ export function CatalogSearchOverlay() {
 		setSelectedTags((prev) => prev.filter((t) => t !== tagName));
 	}
 
-	function handleAddStub() {
-		// Stub: actual add-to-collection / add-to-thread wired in Phase 21
+	const openAddToCollection = useUIStore((s) => s.openAddToCollection);
+	const openAddToThread = useUIStore((s) => s.openAddToThread);
+
+	function handleAdd(item: { id: number; brand: string; model: string }) {
+		const itemName = `${item.brand} ${item.model}`;
+		if (catalogSearchMode === "collection") {
+			openAddToCollection(item.id, itemName);
+		} else if (catalogSearchMode === "thread") {
+			openAddToThread(item.id, itemName);
+		}
 	}
 
 	const contextText =
@@ -398,7 +406,7 @@ export function CatalogSearchOverlay() {
 												<GridCard
 													key={item.id}
 													item={item}
-													onAdd={handleAddStub}
+													onAdd={() => handleAdd(item)}
 													weight={weight}
 													price={price}
 												/>
@@ -410,7 +418,7 @@ export function CatalogSearchOverlay() {
 												<ListRow
 													key={item.id}
 													item={item}
-													onAdd={handleAddStub}
+													onAdd={() => handleAdd(item)}
 													weight={weight}
 													price={price}
 												/>