* Virtualize workspace board lanes and defer card render for instant open
* fix(review): harden kanban virtualization interaction edges
Cancel deferred card mount on close, re-apply marquee preview after remounts,
query drag styles from live DOM, drop re-exports/casts, and cover edge cases.
* Remove virtualizer from effect deps to avoid unnecessary re-runs
* Fix stale closure in kanban area-selection and card-drag handlers
- Refresh area selection measurements on pointer up to avoid stale cache
- Read worktree IDs ref directly in drag handler to close stale closure
* Remove itemIds ref for correct virtualizer layout memoization
The card list kept itemIds in a mutable ref that was manually synced on every render, so the layout registration effect never re-ran when the lane contents changed, leaving stale measurements. Read itemIds directly and declare it as an effect dependency so layout registration stays in sync with the items.
b5abab8b09