Gestures (Stage + Timeline):
- Pinch-zoom via zoom_delta() (touch pinch + Ctrl+wheel), unified with the raw-wheel
path so Ctrl+wheel zooms exactly once; plain wheel zoom + trackpad pan preserved.
- Double-tap empty → zoom-to-fit (Stage: artboard via zoom_to_fit; Timeline: new
fit_to_project over the full duration).
- Double-tap-drag on empty → transient marquee regardless of the active tool.
Long-press context menu: a shared SharedPaneState.mobile_context_menu that panes
populate with (label, MenuAction) items on secondary_clicked(); the mobile shell
renders one persistent popup (styled like the timeline menu) and dispatches via
pending_menu_actions. Stage offers Cut/Copy/Duplicate/Delete for clip instances and
Cut/Copy/Convert-to-movie-clip/Delete for geometry.
Fixes surfaced along the way:
- Geometry delete now frees selected fills (free_fill) and GCs isolated vertices
(new VectorGraph::gc_isolated_vertices) — no more orphaned fills / phantom snap
points; applies to the Delete key too.
- clipboard_delete_selection clears focus so deleting dismisses the mobile inspector.
- Mobile inspector: appears on pointer release (not press) so drags aren't
interrupted; reflows only when the tapped point is actually behind the sheet; taps
outside the sheet dismiss it; rounded-corner border no longer detaches.
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