⚡ Bolt: Memoize table groupings to prevent unnecessary recalculations on toggle

[seonghobae]

💡 What: Wrapped the O(n) groupByType and groupByLevel logic inside ActorTable.tsx and UsecaseTable.tsx with useMemo.
🎯 Why: The tables maintain local collapsed state to toggle group visibility. Without memoization, expanding or collapsing a group triggers a re-render that recalculates the array grouping from scratch. This optimization ensures grouping only occurs when the actors or usecases array changes, freeing up the main thread during UI interactions.
📊 Impact: Reduces unnecessary recalculations and object creations by 100% on collapse/expand toggle operations.
🔬 Measurement: Verify by running the application and toggling groups in the Actor and Usecase tables; performance should be slightly smoother. Unit tests were run with pnpm --filter @vooster/app run test to verify no functionality was broken.

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PR created automatically by Jules for task 6096634939992587190 started by @seonghobae

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📥 Commits

Reviewing files that changed from the base of the PR and between b2d68a0 and 6f748a1.

📒 Files selected for processing (3)

• .jules/bolt.md
• apps/app/app/components/ActorTable.tsx
• apps/app/app/components/UsecaseTable.tsx

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[seonghobae]

통합 PR에서 유효 변경만 선별해 다시 다루고 있어 이 중복/잔여 PR은 정리합니다. #39 및 vibemafiaclub/vooster#34를 기준으로 후속 검토를 진행합니다.