⚡ Bolt: React useMemo optimizations for derived state

[ayush-kumar-21]

💡 What:
Wrapped filteredCases (and similar derived arrays like selectedCase) in useMemo hooks across multiple pages (CaseQueuePage, EvidenceVault, SmartBailPage, CitizenTimeline).

🎯 Why:
These React components previously re-filtered mock data arrays on every render (e.g. if any other local state changed). Moving this computation inside useMemo guarantees the filtering logic only runs when its dependencies (like search queries or filters) change, saving CPU cycles on re-renders and following React best practices to prevent the 'derived state' anti-pattern.

📊 Impact:
Reduces unnecessary array filtering operations by 100% on unrelated re-renders. Avoids allocating a new filteredCases array object in memory every render cycle, which decreases garbage collection pressure and could prevent cascading re-renders in child components.

🔬 Measurement:
Can be measured using the React DevTools Profiler by recording a session, interacting with the component (e.g., clicking on elements), and verifying that the filteredCases computation time is no longer present in subsequent render cycles where the search query/filter remained unchanged.

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PR created automatically by Jules for task 11794331390348466677 started by @ayush-kumar-21

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