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/routes/global-items/$globalItemId.tsx

@@ -1,6 +1,7 @@
 import { createFileRoute, Link } from "@tanstack/react-router";
 import { useFormatters } from "../../hooks/useFormatters";
 import { useGlobalItem } from "../../hooks/useGlobalItems";
+import { useUIStore } from "../../stores/uiStore";
 
 export const Route = createFileRoute("/global-items/$globalItemId")({
 	component: GlobalItemDetail,
@@ -10,6 +11,8 @@ function GlobalItemDetail() {
 	const { globalItemId } = Route.useParams();
 	const { data: item, isLoading, error } = useGlobalItem(Number(globalItemId));
 	const { weight, price } = useFormatters();
+	const openAddToCollection = useUIStore((s) => s.openAddToCollection);
+	const openAddToThread = useUIStore((s) => s.openAddToThread);
 
 	if (isLoading) {
 		return (
@@ -126,15 +129,22 @@ function GlobalItemDetail() {
 				)}
 			</div>
 
-			{/* Add to Collection */}
-			<div className="mb-6">
+			{/* Action buttons */}
+			<div className="flex gap-3 mb-6">
 				<button
 					type="button"
-					onClick={() => console.log("Add to collection — wired in Phase 22")}
+					onClick={() => openAddToCollection(item.id, `${item.brand} ${item.model}`)}
 					className="bg-gray-700 text-white rounded-lg px-5 py-2.5 text-sm font-medium hover:bg-gray-800 transition-colors"
 				>
 					Add to Collection
 				</button>
+				<button
+					type="button"
+					onClick={() => openAddToThread(item.id, `${item.brand} ${item.model}`)}
+					className="bg-white text-gray-700 border border-gray-200 rounded-lg px-5 py-2.5 text-sm font-medium hover:bg-gray-50 transition-colors"
+				>
+					Add to Thread
+				</button>
 			</div>
 
 			{/* Description */}