add rescan button

frontend/src/components/FileBrowser/FileBrowser.tsx

@@ -8,9 +8,11 @@ interface Props {
 }
 
 export default function FileBrowser({ libraryId }: Props) {
-  const [currentPath, setCurrentPath] = useState("");
+  const [libraryPaths, setLibraryPaths] = useState<Record<number, string>>({});
   const [viewingId, setViewingId] = useState<number | null>(null);
 
+  const currentPath = libraryPaths[libraryId] ?? "";
+
   const { data, isLoading } = useQuery<BrowseResult>({
     queryKey: ["browse", libraryId, currentPath],
     queryFn: () => api.libraries.browse(libraryId, currentPath),
@@ -19,7 +21,7 @@ export default function FileBrowser({ libraryId }: Props) {
   const pathParts = currentPath ? currentPath.split("/").filter(Boolean) : [];
 
   function navigate(relPath: string) {
-    setCurrentPath(relPath);
+    setLibraryPaths((prev) => ({ ...prev, [libraryId]: relPath }));
     setViewingId(null);
   }