Every bounding-box handle in the Composition viewer showed the
north-west / south-east resize cursor, so two corners and all four
edges showed the wrong direction.
Each handle now takes the cursor along the direction it scales, worked
out from the on-screen box: a corner points between its two edges (the
box's diagonal whatever its proportions), an edge handle across its
edge. The cursors turn with the layer's rotation, as in After Effects.
Tests: handle_cursors_follow_each_handle_and_the_layer_rotation
(ui_viewer: a wide box at 0°, 90° and 45°).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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