refactor(sync): collapse 11 sync args into forwarded token array

- Replace syncHost/syncSnapshotPath/… with syncCliTokens: string[] passed verbatim to --sync-cli sync
- Move sync CLI validation from launcher to parseSyncCliTokens (app-side single owner)
- Extract resolveImmersionDbPath to shared db-path.ts importable by both launcher and app
- Delete driver.ts; inline types into libsql-driver.ts and hard-wire openLibsqlSyncDb
- Drop OpenSyncDb injection from mergeSnapshotIntoDb and createDbSnapshot

launcher/commands/playback-command.test.ts

@@ -37,17 +37,7 @@ function createContext(): LauncherCommandContext {
       useRofi: false,
       history: false,
       sync: false,
-      syncHost: '',
-      syncSnapshotPath: '',
-      syncMergePath: '',
-      syncDirection: 'both',
-      syncRemoteCmd: '',
-      syncDbPath: '',
-      syncForce: false,
-      syncJson: false,
-      syncCheck: false,
-      syncMakeTemp: false,
-      syncRemoveTempPath: '',
+      syncCliTokens: [],
       syncUi: false,
       logLevel: 'info',
       logRotation: 7,