feat(desktop): improve AttentionRail and chat UX#3
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- ChangesRail: flatten tree + useVirtualizer (28px rows, overscan 20) - Unified diff: virtualize FileDiffView list with dynamic height measurement - Split diff: virtualize + lazy-fetch file contents (only visible items queried) - ProjectFilesPanel: flatten tree + useVirtualizer for project file browser - AttentionRail: pre-compute coalesceUpdates in useMemo cache, pinned→Set, memoize all derived data; move to fixed overlay with slide animation - Stream virtualizer: increase estimateSize 72→100, overscan 12→30 - ChangesRail: collapse folders by default when >50 files
- SessionRailCard: memo with React.memo, coalesceUpdates moved inside (computes per-card only when its own updates change, not all tasks) - Remove previewCache that ran coalesceUpdates for ALL tasks on every render - Pass raw updates array to card, let memo handle staleness - App.tsx: useCallback for handleOpenTask passed to AttentionRail - Inline pin/open callbacks → stable useCallback curried per task id
- Board: useMemo for 8 derived arrays (done, running, review, laneTrees*), memoize match fn and byStatus with cache - TaskDetail: useCallback for openFileTab, openDiffFile, openChangesTab - MissionControl: useMemo for live/pinnedTasks, memoize all FocusPane derived computations (coalesceUpdates, resolvedPermissions, etc.), stable callbacks for pinned task map - ChangesRail: useCallback for toggle - Projects: useMemo for services/pfs/projectTasks/running, pre-compute runningByProject map to eliminate O(projects × services) filter-in-map
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