feat(device-sync): overhaul Device Sync page

- New two-panel layout with live album search (search3, 300ms debounce)
  and 10 random albums when search is empty — replaces full paginated load
- Pre-sync summary modal: shows files to add/delete, net change, available
  space; Proceed button disabled when space is insufficient
- calculate_sync_payload now filters already-synced tracks (path exists on
  device) so add_bytes/add_count reflect the true delta
- Space check accounts for pending deletions: addBytes > availableBytes + delBytes
- Separate deviceSyncJobStore for ephemeral job progress state
- Removable drive detection + auto-poll every 5 s via sysinfo
- Desired-state diff: de-selecting a synced source stages it for deletion
  instead of silently removing it
- Status badges (Synced / Pending / Deletion) with matching row highlights
- Live-Search badge (⚡) and Zufallsalben section label (⇌) in album browser
- Status summary row height aligned with search field (52 px)
- i18n: all new keys added to all 8 locales (en/de/fr/nl/nb/zh/ru/es)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/store/deviceSyncJobStore.ts

@@ -0,0 +1,36 @@
+import { create } from 'zustand';
+
+export interface DeviceSyncJobState {
+  jobId: string | null;
+  total: number;
+  done: number;
+  skipped: number;
+  failed: number;
+  status: 'idle' | 'running' | 'done' | 'cancelled';
+
+  startSync: (jobId: string, total: number) => void;
+  updateProgress: (done: number, skipped: number, failed: number) => void;
+  complete: (done: number, skipped: number, failed: number) => void;
+  reset: () => void;
+}
+
+export const useDeviceSyncJobStore = create<DeviceSyncJobState>()((set) => ({
+  jobId: null,
+  total: 0,
+  done: 0,
+  skipped: 0,
+  failed: 0,
+  status: 'idle',
+
+  startSync: (jobId, total) =>
+    set({ jobId, total, done: 0, skipped: 0, failed: 0, status: 'running' }),
+
+  updateProgress: (done, skipped, failed) =>
+    set({ done, skipped, failed }),
+
+  complete: (done, skipped, failed) =>
+    set({ done, skipped, failed, status: 'done' }),
+
+  reset: () =>
+    set({ jobId: null, total: 0, done: 0, skipped: 0, failed: 0, status: 'idle' }),
+}));