"Edit cell boxes" mode: the selected cell grows resize handles on the
preview -- drag to move/resize with live outline tracking and a re-render
on drop, or type exact X/Y/W/H in the new geometry fields. Plain clicks
still select and cycle stacked cells (click-vs-drag resolved by a movement
threshold on mouse-up). The move/resize math is pure and unit-tested
(OverlayRegionEdit: corner/edge/move handle hit-testing with tolerance,
min-size clamped resizing that pins the opposite edge). "Save template"
persists the shared cell geometry back to the regions.json; "Reload
template" re-reads it to discard unsaved box edits. Cursor feedback per
handle; template save/reload disabled when no template path was supplied.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
CydandClaude Fable 5
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