fix: refresh sidebar counts after photo mutations

LIBRARY_STATS_QUERY_KEY was never invalidated by the bulk/single
mutation paths in RightSidebar and PhotoInfoPanel, so the All Photos
/ Rated / Discarded / Tags badges only updated on reload. Add it to
both shared invalidation helpers and the inline updateMutation, and
correct the stale docstring on useLibraryStatsQuery.

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

frontend/src/components/layout/RightSidebar.tsx

@@ -10,6 +10,7 @@ import {
 } from '../../services/api'
 import { useActiveHeapMembers } from '../../hooks/useActiveHeapMembersQuery'
 import { HEAPS_QUERY_KEY } from '../../hooks/useHeapsQuery'
+import { LIBRARY_STATS_QUERY_KEY } from '../../hooks/useLibraryStatsQuery'
 import { useTagsQuery, TAGS_QUERY_KEY } from '../../hooks/useTagsQuery'
 import { toast } from '../ToastContainer'
 import { PhotoInfoPanel } from '../sidebar/PhotoInfoPanel'
@@ -32,6 +33,7 @@ export function RightSidebar({ onCollapse }: RightSidebarProps) {
   const invalidatePhotoQueries = () => {
     queryClient.invalidateQueries({ queryKey: ['photo'] })
     queryClient.invalidateQueries({ queryKey: ['photos'] })
+    queryClient.invalidateQueries({ queryKey: LIBRARY_STATS_QUERY_KEY })
   }
 
   const bulkRatingMutation = useMutation({

frontend/src/components/sidebar/PhotoInfoPanel.tsx

@@ -21,6 +21,7 @@ import {
 } from '../../services/api'
 import { useActiveHeapMembers } from '../../hooks/useActiveHeapMembersQuery'
 import { HEAPS_QUERY_KEY } from '../../hooks/useHeapsQuery'
+import { LIBRARY_STATS_QUERY_KEY } from '../../hooks/useLibraryStatsQuery'
 import { useTagsQuery, TAGS_QUERY_KEY } from '../../hooks/useTagsQuery'
 import { toast } from '../ToastContainer'
 import {
@@ -147,6 +148,7 @@ export function PhotoInfoPanel({ photoId, darkTheme = false }: PhotoInfoPanelPro
     onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: ['photo', photoId] })
       queryClient.invalidateQueries({ queryKey: ['photos'] })
+      queryClient.invalidateQueries({ queryKey: LIBRARY_STATS_QUERY_KEY })
     },
   })
 
@@ -194,6 +196,7 @@ export function PhotoInfoPanel({ photoId, darkTheme = false }: PhotoInfoPanelPro
     queryClient.invalidateQueries({ queryKey: TAGS_QUERY_KEY })
     queryClient.invalidateQueries({ queryKey: ['photo', photoId] })
     queryClient.invalidateQueries({ queryKey: ['photos'] })
+    queryClient.invalidateQueries({ queryKey: LIBRARY_STATS_QUERY_KEY })
   }
 
   const addTagMutation = useMutation({

frontend/src/hooks/useLibraryStatsQuery.ts

@@ -6,8 +6,9 @@ export const LIBRARY_STATS_QUERY_KEY = ['library', 'stats'] as const
 /**
  * Per-section counts for the LeftSidebar badges (All Photos, Rated,
  * Duplicates, Discarded). Cached briefly so navigating around doesn't
- * re-fetch on every click; invalidated on photo mutations through the
- * standard ['photos'] invalidation in the mutation onSuccess paths.
+ * re-fetch on every click. Mutations that change a photo's rating,
+ * discard flag, tags, etc. must invalidate LIBRARY_STATS_QUERY_KEY in
+ * their onSuccess so the badges stay live.
  */
 export function useLibraryStatsQuery() {
   return useQuery<LibraryStats>({