Akiba So 4886f1b2df feat(storage): one-time SQLite to sidecar migration ...

Phase 5. On first launch with a valid vault, migrate legacy SQLite
data into vault sidecars so nothing is lost on upgrade.

- SqliteToSidecarMigrator: documents (+ per-page ink, scratch-links
  + scratchpads, bookmarks) -> notebook folder + <file>.badnote.json;
  notes (+ strokes) -> notebook.badnote.json. Reuses existing JSON.
- Idempotent (skips already-migrated targets); missing source files
  still get their annotations migrated.
- DB relocates to <vault>/.badnote/index.sqlite; the legacy DB is
  renamed to .premigration ONLY after a successful pass, so a failed
  migration leaves data intact and the run-once flag unset.
- main.dart runs it once, gated on vaultMigrationDone.

Golden migrator tests (seeded legacy DB -> sidecars, idempotent
re-run, legacy preserved). analyze clean, tests green.

2026-06-24 23:05:10 +08:00

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