Akiba So
e4a94d00c0
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Per the full-refactor plan (P0/P1/P2 modules, all pressure-independent): - engine/undo_stack: generic snapshot undo/redo (per page in the editor) - ui/thumbnail_grid: Drawboard-style lazy thumbnail nav sheet (pdfrx) - input/pen_config + ui/pen_settings_page: configurable side-button / eraser-end action mapping, pressure curve, palm sensitivity, finger drawing, widths (shared_preferences). Button-action mappings persist but consume in the input arbiter later; widths/finger consumed now. Wired into the live editor (undo/redo + grid + settings buttons). 19 new tests.