Phase 5 abgeschlossen

- SQLite-Setup: `src/main/store/db.ts` (better-sqlite3, Migration)
- Lokaler VOD-Verlauf (Resume)
- mpv `time-pos`-Observer schreibt alle ~5s in DB
- Auto-Resume: beim VOD-Start Position aus DB lesen → `--start=<s>`
 -Resume-Indikator auf VOD-Karte
 - Completed-Indikator (dunkles Overlay + Checkmark)

package.json

@@ -16,11 +16,14 @@
     "package": "electron-vite build && electron-builder --linux"
   },
   "dependencies": {
+    "better-sqlite3": "^12.8.0",
     "qrcode": "^1.5.4",
     "react": "^18.3.1",
     "react-dom": "^18.3.1"
   },
   "devDependencies": {
+    "@electron/rebuild": "^4.0.3",
+    "@types/better-sqlite3": "^7.6.13",
     "@types/node": "^20.14.0",
     "@types/qrcode": "^1.5.5",
     "@types/react": "^18.3.3",