Akiba So 0ae2671f9b feat(split): scratchpad inks on the pen-first canvas ...

The split-view scratchpad was the last surface on the old ink_canvas. Move
its inking engine to the performant PenCanvas while keeping the infinite
auto-expanding world.

Key idea: store strokes in absolute WORLD pixels (InkStroke — unchanged
saveScratchpad format) and render through PenCanvas by normalizing against
the CURRENT world size. When the world auto-expands, stored world coords do
not move — only the normalization divisor grows — so ink stays put with zero
drift (proven by the world-expand-stability test).

- Replace InteractiveViewer+SizedBox+InkCanvas with PenCanvas (own pan/zoom,
  minScale 0.1 to survey the big world); keep the AnnotationToolbar.
- Stroke callbacks go through ink_stroke_adapter; load filters to freehand
  so the canvas list stays 1:1 with the undo manager.
- Pen/highlighter/eraser map from the toolbar's PenTool; width is world px.

The left PDF-reference pane (SfPdfViewer, read-only) is unchanged.

Tests: world-expand stability added. flutter analyze: 0. Suite: 270/270.

2026-06-23 15:52:52 +08:00

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