Phase 4. Standalone notes move off SQLite into the vault, like the
PDF annotations.
- "Create notebook" makes a vault folder with a notebook.badnote.json
(BadnoteSidecar docType 'notebook' + a title field), opened via
SidecarRepository.
- PenNoteScreen loads/saves its strokes (page 0) + title to that
sidecar instead of the SQLite Note model.
- note_provider lists notes from a vault scan (VaultService.scanNotes
= folders with notebook.badnote.json and no source file); the doc
scan still excludes them. Delete removes the folder.
PDF/slide editors unchanged; pre-existing SQLite notes migrate in
Phase 5. analyze clean, tests green.
Phase 1 of the file-based storage plan. Pure library, no runtime
behavior change yet (editors still use SQLite).
- BadnoteSidecar: per-file annotation document (schema-versioned)
holding per-page ink (EditorStroke JSON), text highlights,
scratch-link anchors (ScratchLink JSON) each with its own
scratchpad (InkStroke world-coord JSON), and bookmarks. Reuses the
existing toJson formats — no parallel stroke format.
- SidecarStore.writeAtomic: temp-file + rename atomic write keeping a
.bak; read() falls back to .bak on a missing/corrupt primary.
Round-trip + atomic-write + .bak-recovery tests. analyze clean,
322 tests green.
