Resizing the document leaves raster layers as-is (canvas keeps its old pixel size,
anchored top-left). To reconcile, the info panel now shows the active raster
layer's canvas size — driven by the *active* layer, not selection focus, since
painting doesn't focus the layer — and, when it differs from the document, a
Scale / Expand-Crop toggle + a "Layer to document size" button.
- RasterKeyframe::resize_to(w, h, mode): always applies the new declared size;
resamples (Lanczos3) when Scale, top-left pad/trim when Canvas, and only touches
the buffer when pixels are resident (a blank canvas just takes the new size).
Sets texture_dirty so the stage's dirty-scan refreshes the GPU texture.
- ResizeRasterLayerAction resizes every keyframe with undo, holding a (read-only)
RasterStore so paged-out keyframes are loaded one at a time rather than bulk.
Resized keyframes stay resident + dirty and persist on the next full save (no
incremental store write to page them back out). Scale is lossy/compounds;
Expand-Crop is lossless.
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