fix(perf): remove redundant router.refresh() calls from note-card.tsx

Remove 5 unnecessary router.refresh() calls in optimistic update handlers
(togglePin, toggleArchive, handleColorChange, handleCheckItem, handleRemoveFusedBadge).
These handlers already use addOptimisticNote() for instant UI feedback and
the server actions call revalidatePath('/') for cache invalidation.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

keep-notes/components/note-card.tsx

@@ -233,7 +233,6 @@ export const NoteCard = memo(function NoteCard({
     startTransition(async () => {
       addOptimisticNote({ isPinned: !note.isPinned })
       await togglePin(note.id, !note.isPinned)
-      router.refresh()
 
       if (!note.isPinned) {
         toast.success(t('notes.pinned') || 'Note pinned')
@@ -247,7 +246,6 @@ export const NoteCard = memo(function NoteCard({
     startTransition(async () => {
       addOptimisticNote({ isArchived: !note.isArchived })
       await toggleArchive(note.id, !note.isArchived)
-      router.refresh()
     })
   }