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Re-port the WASM canvas font fallback onto main's new skrifa/harfrust shaping pipeline: - Add `chr` to `ShapedGlyph` and trigger the canvas fallback from `allocate_glyph` on NOTDEF (WASM only). - Drive the fallback from `text_layout`'s NOTDEF branch via `has_glyph`, so it only kicks in when no loaded font contains the character. - Update `allocate_canvas_glyph` for main's `GlyphAllocation` (uv_rect only) and `color_transfer_function` API; fix `get_image_data` f64 args. Merge the per-axis scroll fade gating into main's refactored `paint_fade_areas_impl`. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>