refactor(fe): replace TanStack Query with SWR + UI/data cleanup

Rombak data layer frontend:
- Hapus @tanstack/react-query (package.json, lockfile, provider di
  dashboard layout) — ganti SWR 2.4.2 + SWRConfig (revalidateOnFocus
  false, deduping 10s, no retry on 404)
- Semua hooks data ditulis ulang ke useSWR; useAction() helper baru
  pengganti useMutation dengan surface kompatibel (mutate/mutateAsync/
  isPending/error)
- useMessages + useMessagesHasMore share satu SWR key — probe cursor
  yang tadinya dobel fetch API sekarang deduped
- WS sync (messages/media/recordings) pindah dari queryClient ke
  SWR mutate dengan filter key + revalidate:false
- useMessageSearch() dipakai search-panel & search-overlay; search
  overlay backdrop div -> button (fix a11y lint)

Rapikan UI + isi data:
- Tab stats recordings: placeholder 'coming soon' diganti stat asli
  (total, ukuran, speaker unik, top speakers)
- Empty states konsisten via EmptyState (images/review/recordings),
  EmptyState terima className
- biome check --write: 0 error, 8 warning pre-existing
- Verifikasi: tsc --noEmit PASS, next build PASS (11 halaman static),
  API live dicek — semua endpoint dashboard/messages/guilds/config/
  voice/media/recordings/review balikin data

services/frontend/src/hooks/use-recordings.ts

@@ -1,37 +1,39 @@
-import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
 import { useEffect } from "react";
-
+import useSWR, { useSWRConfig } from "swr";
+import { useAction } from "@/hooks/use-action";
 import { recordingsApi } from "@/lib/api";
 import type { VoiceRecording } from "@/lib/types";
 import type { WsHook } from "@/lib/ws-hook";
 
+const RECORDINGS_KEY = ["recordings"] as const;
+
 export function useRecordings() {
-  return useQuery<VoiceRecording[]>({
-    queryKey: ["recordings"],
-    queryFn: async () => {
-      const res = await recordingsApi.list(50);
-      return res.items;
-    },
+  return useSWR<VoiceRecording[]>(RECORDINGS_KEY, async () => {
+    const res = await recordingsApi.list(50);
+    return res.items;
   });
 }
 
 export function useDeleteRecording() {
-  const qc = useQueryClient();
-  return useMutation({
-    mutationFn: (id: string) => recordingsApi.delete(id),
-    onSuccess: () => qc.invalidateQueries({ queryKey: ["recordings"] }),
+  const { mutate } = useSWRConfig();
+  return useAction((id: string) => recordingsApi.delete(id), {
+    onSuccess: () => {
+      void mutate(RECORDINGS_KEY);
+    },
   });
 }
 
 export function useRecordingsWsSync(ws: WsHook) {
-  const qc = useQueryClient();
+  const { mutate } = useSWRConfig();
   useEffect(() => {
     const unsub = ws.on("voice_recording_uploaded", (data) => {
       const rec = data as VoiceRecording;
-      qc.setQueryData<VoiceRecording[]>(["recordings"], (old) =>
-        old ? [rec, ...old] : [rec],
+      void mutate(
+        RECORDINGS_KEY,
+        (old: VoiceRecording[] | undefined) => (old ? [rec, ...old] : [rec]),
+        { revalidate: false },
       );
     });
     return unsub;
-  }, [ws, qc]);
+  }, [ws, mutate]);
 }