When importing a backup file locally, archive data (archiveYoung and
archiveOld) was not being persisted to IndexedDB. This caused archived
tasks to be lost after page reload.
Root cause: ArchiveOperationHandler._handleLoadAllData() returns early
for local imports (isRemote=false), expecting the archive to be written
by the backup import flow - but this code never existed.
Fix: Add _writeArchivesToIndexedDB() to BackupService.importCompleteBackup()
that explicitly writes archive data to IndexedDB after dispatching the
loadAllData action.
- Add ArchiveDbAdapter injection to BackupService
- Add _writeArchivesToIndexedDB() private method
- Update misleading comment in ArchiveOperationHandler
- Add unit tests for archive persistence (7 tests)
- Add E2E tests for archive import persistence (3 tests)
- Add test fixture with archive data
