* fix(canvas): edit section labels inline
- Vertically center shaped section titles using cached paragraph metrics\n- Add generalized canvas-label edit state and a reusable inline label control\n- Match dark and light label presentation while editing and commit renames with undo
* fix(canvas): align label contrast handling
Use shared WCAG contrast selection for rendered and edited canvas labels while retaining exact node-fill presentation in the editing overlay.
* fix(canvas): composite translucent label colors
Choose label foreground contrast after compositing translucent section fills against the active canvas background.
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