feat: synthesize size 32 (catalog icon) frame for all furniture .nitro bundles

AddSize32ToBundle downscales the largest existing sprite (usually size 64)
to generate a 32 visualization, so every bundle — including the
source-provided gamedata furniture — carries a 32 frame without needing the
original SWF. AddSize32AllNitros rewrites every existing .nitro across all
nitro directories (incl. /var/www/Gamedata/bundled/furniture) and is
idempotent (bundles that already have 32 are skipped). Expose it via a Studio
button and the background admin endpoint POST /api/admin/import/furni/add-size32.

src/app/admin/import/furni/import-furni-client.tsx

@@ -12,6 +12,7 @@ import {
 	FileWarning,
 	FolderSync,
 	Globe2,
+	ImageDown,
 	LayoutGrid,
 	List,
 	Loader2,
@@ -147,6 +148,7 @@ export function ImportFurniClient({ source }: { source: FurniImportSource }) {
 	const [recentResyncResult, setRecentResyncResult] =
 		useState<RecentFurniResyncResult | null>(null);
 	const [verifyingInteractions, setVerifyingInteractions] = useState(false);
+	const [addingSize32, setAddingSize32] = useState(false);
 	const [verifyResult, setVerifyResult] =
 		useState<VerifyInteractionsResult | null>(null);
 	const searchRef = useRef<HTMLInputElement>(null);
@@ -775,6 +777,38 @@ export function ImportFurniClient({ source }: { source: FurniImportSource }) {
 		}
 	}
 
+	async function addSize32All() {
+		if (
+			!confirm(
+				"Add a size-32 visualization to every existing .nitro that lacks one? This rewrites the live furniture bundles (incl. /var/www/Gamedata) and can take a while.",
+			)
+		) {
+			return;
+		}
+		setAddingSize32(true);
+		try {
+			const res = await adminFetch("/api/admin/import/furni/add-size32", {
+				method: "POST",
+			});
+			const d = await res.json();
+			if (res.ok) {
+				toast.success(
+					d.alreadyRunning
+						? "Size-32 conversion is already running in the background"
+						: "Started size-32 conversion in the background — watch the server log for progress",
+				);
+			} else {
+				toast.error(d.error || "Failed to start size-32 conversion");
+			}
+		} catch (error) {
+			toast.error(
+				error instanceof Error ? error.message : "Size-32 conversion failed",
+			);
+		} finally {
+			setAddingSize32(false);
+		}
+	}
+
 	async function applyReorganize() {
 		setReorgPreview(null);
 		setReorganizing(true);
@@ -1551,6 +1585,10 @@ export function ImportFurniClient({ source }: { source: FurniImportSource }) {
 							<FolderSync className="w-4 h-4 mr-2" />
 							{reorganizing ? "Reorganizing..." : "Reorganize Catalog"}
 						</DropdownMenuItem>
+						<DropdownMenuItem onClick={addSize32All} disabled={addingSize32}>
+							<ImageDown className="w-4 h-4 mr-2" />
+							{addingSize32 ? "Adding size 32..." : "Add size 32 to all .nitro"}
+						</DropdownMenuItem>
 						<DropdownMenuItem
 							onClick={verifyAllInteractions}
 							disabled={verifyingInteractions}