feat: virtualized tag manager with filter, sort, and light-theme support

Replaces the flat TagManageRow list with a virtualized grid of
TagManageTile cards using @tanstack/react-virtual and dynamic measured
heights (46px idle, 82px when editing/confirming). Adds a filter input
and a sort dropdown (most-used / least-used / A-Z / Z-A). renameTag and
deleteTag no longer clear exploreTagEntries on invalidation so the
manager keeps its filter/sort state during the background refresh.
Light-theme overrides cover all new tag-manager class names.

src/store.ts

@@ -2370,9 +2370,10 @@ export const useGalleryStore = create<GalleryState>((set, get) => ({
   renameTag: async (from, to) => {
     await invoke("rename_tag", { params: { from, to } });
     // Tag content changed — invalidate the explore-tags and tag-cloud caches.
+    // Keep the current tag list visible while the refresh runs so manager UI
+    // state such as filtering and sorting is not lost to a loading remount.
     set({
       exploreTagsFolderId: undefined,
-      exploreTagEntries: [],
       tagCloudFolderId: undefined,
       tagCloudEntries: [],
     });
@@ -2388,9 +2389,10 @@ export const useGalleryStore = create<GalleryState>((set, get) => ({
 
   deleteTag: async (tag) => {
     const removed = await invoke<number>("delete_tag", { params: { tag } });
+    // Keep the current tag list visible while the refresh runs so manager UI
+    // state such as filtering and sorting is not lost to a loading remount.
     set({
       exploreTagsFolderId: undefined,
-      exploreTagEntries: [],
       tagCloudFolderId: undefined,
       tagCloudEntries: [],
     });