Draw on slides while presenting, kept as a layer fully separate from the
Marp content so the deck stays pure, portable Marp.
Presenter tools (D pen, T highlighter, E eraser, X laser, C clear, Esc
puts the tool away) with a small floating colour/tool bar shown only when
a tool is active. Strokes use coordinates normalized to the 16:9 slide so
they render identically on the laptop and the beamer; in dual-screen mode
the ink and the laser are mirrored live to the audience window.
Persistence (decoupled from the .md):
- In memory the layer is keyed by Slide.id (stable within a session).
- On disk it lives in a sidecar <name>.ink.json next to the deck and as a
separate entry inside the .ocideck package; the markdown is untouched.
- Because slide ids are regenerated on load, the sidecar anchors strokes
by order + a content fingerprint, re-attaching them after reordering and
dropping them when a slide's content changed.
- Deck.annotations carries the layer in memory but is never serialized to
markdown; deckProvider.setAnnotations keeps it out of undo/redo.
flutter analyze is clean, all tests pass (incl. new stroke/codec tests),
and the macOS debug build compiles. Drawing and live beamer sync still
need verification on real hardware.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
227abf351e