feat: implement cache busting mechanism and UI improvements

- Added `useCacheBust` composable to manage cache invalidation after movie edits in the admin panel.
- Integrated cache busting in movie sync and delete actions to ensure data consistency across pages.
- Enhanced UI components in the admin movie management and member management pages for better readability and usability.
- Introduced a suggestions tab in the movie detail page to recommend similar movies based on categories.
- Updated styles for various elements to improve the overall aesthetic and user experience.

app/assets/css/main.css

@@ -76,3 +76,101 @@ select:disabled {
 .no-scrollbar::-webkit-scrollbar {
   display: none;
 }
+
+/* Admin design system — Modern Minimal Enterprise */
+@layer utilities {
+  .admin-page {
+    @apply min-h-screen bg-[#0A0B0E] text-zinc-100 antialiased;
+  }
+
+  /* Flat, neutral enterprise card */
+  .admin-card {
+    @apply rounded-2xl border border-white/[0.07] bg-[#131418] transition-colors duration-200 hover:border-white/[0.14];
+  }
+
+  /* Card with subtle top highlight for hierarchy */
+  .admin-card-gradient {
+    @apply rounded-2xl border border-white/[0.07] bg-[#131418] transition-colors duration-200 hover:border-white/[0.14];
+    background-image: linear-gradient(180deg, rgba(255, 255, 255, 0.025), transparent 40%);
+  }
+
+  .admin-input {
+    @apply h-11 w-full rounded-xl border border-white/[0.08] bg-white/[0.03] px-4 text-sm text-white placeholder:text-zinc-500 outline-none transition focus:border-yellow-400/40 focus:bg-white/[0.05] focus:ring-2 focus:ring-yellow-400/15;
+  }
+
+  .admin-btn {
+    @apply inline-flex h-10 items-center justify-center gap-2 rounded-xl px-5 text-sm font-semibold transition-all duration-150 active:scale-[0.98];
+  }
+
+  .admin-btn-primary {
+    @apply inline-flex h-10 items-center justify-center gap-2 rounded-xl px-5 text-sm font-semibold transition-all duration-150 active:scale-[0.98] bg-yellow-400 text-zinc-950 hover:bg-yellow-300 hover:shadow-lg hover:shadow-yellow-400/20;
+  }
+
+  .admin-btn-secondary {
+    @apply inline-flex h-10 items-center justify-center gap-2 rounded-xl px-5 text-sm font-semibold transition-all duration-150 active:scale-[0.98] border border-white/[0.08] bg-white/[0.04] text-zinc-100 hover:bg-white/[0.08];
+  }
+
+  .admin-btn-danger {
+    @apply inline-flex h-10 items-center justify-center gap-2 rounded-xl px-5 text-sm font-semibold transition-all duration-150 active:scale-[0.98] bg-red-500/10 text-red-400 hover:bg-red-500/20;
+  }
+
+  .admin-badge {
+    @apply inline-flex items-center rounded-full px-2.5 py-0.5 text-xs font-semibold;
+  }
+
+  .admin-label {
+    @apply text-[11px] font-semibold uppercase tracking-[0.14em] text-zinc-500;
+  }
+
+  .admin-section-title {
+    @apply text-[1.6rem] font-bold tracking-tight text-white;
+  }
+
+  .admin-section-subtitle {
+    @apply text-sm text-zinc-500;
+  }
+
+  .admin-num {
+    @apply font-bold tracking-tight text-white tabular-nums;
+  }
+
+  /* Compact controls for dense edit rows */
+  .admin-input-sm {
+    @apply h-8 rounded-lg border border-white/[0.08] bg-white/[0.03] px-2.5 text-xs text-white placeholder:text-zinc-500 outline-none transition focus:border-yellow-400/40 focus:bg-white/[0.05];
+  }
+
+  .admin-btn-sm {
+    @apply inline-flex h-7 items-center justify-center gap-1 rounded-lg px-2.5 text-xs font-semibold transition active:scale-[0.97];
+  }
+
+  .admin-icon-square {
+    @apply grid size-9 place-items-center rounded-xl border border-white/[0.08] bg-white/[0.03] text-zinc-300;
+  }
+}
+
+/* Custom scrollbar for admin tables */
+.admin-scrollbar::-webkit-scrollbar {
+  height: 6px;
+  width: 6px;
+}
+
+.admin-scrollbar::-webkit-scrollbar-thumb {
+  background: rgba(250, 204, 21, 0.5);
+  border-radius: 999px;
+}
+
+.admin-scrollbar::-webkit-scrollbar-track {
+  background: rgba(255, 255, 255, 0.03);
+}
+
+/* Smooth modal fade */
+.modal-fade-enter-active,
+.modal-fade-leave-active {
+  transition: opacity 0.2s ease, transform 0.2s ease;
+}
+
+.modal-fade-enter-from,
+.modal-fade-leave-to {
+  opacity: 0;
+  transform: scale(0.98);
+}