⚡ Bolt: Optimize getVisibleTasks with O(1) Map lookup

[seonghobae]

💡 What: Replaced the O(N) findTask() array lookup with an O(1) Map lookup inside the getVisibleTasks() parent chain iteration loop.
🎯 Why: Filtering visible tasks triggers an O(N^2) operation because evaluating visibility traces up each task's ancestors, linearly scanning the entire tasks array for each ancestor. This change removes the bottleneck.
📊 Impact: Transforms a potentially expensive O(N^2) hierarchical filtering render operation into a fast O(N) operation, enabling smooth performance for much larger WBS datasets.
🔬 Measurement: Verify by executing e2e tests (npm run test:e2e) to ensure tree rendering correctly collapses and expands, and run tests via bash scripts/ci/test_strix_quick_gate.sh.

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PR created automatically by Jules for task 13550940238100569134 started by @seonghobae

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[seonghobae]

이 PR의 변경은 현재 main에 머지된 대표 PR들(#26, #27, #28, #34, #35, #39, #40, #57, #72)에 의해 반영되었거나 더 최신 구현으로 대체되었습니다. 현재 head는 main과 충돌하고 남길 고유 변경이 없어 superseded 상태로 닫습니다.

[google-labs-jules]

이 PR의 변경은 현재 main에 머지된 대표 PR들(#26, #27, #28, #34, #35, #39, #40, #57, #72)에 의해 반영되었거나 더 최신 구현으로 대체되었습니다. 현재 head는 main과 충돌하고 남길 고유 변경이 없어 superseded 상태로 닫습니다.

Understood. Acknowledging that this work is now obsolete and stopping work on this task.