Refactor Help state and improve map/server performance

[0xsamuel1]

Summary

• Extract Help page state into reusable hooks for UI/profile state, location search, request/map state, and wallet state.
• Sync Mapbox viewport state only on camera rest while keeping navigation on imperative Mapbox camera APIs.
• Move shimmer/drift animations to compositor-friendly transform/opacity keyframes with will-change hints.
• Start the prover server with Node cluster workers sized from available CPU cores, while keeping test imports single-process.

Testing

• node --check src/hooks/useHelpUiState.js src/hooks/useLocationSearch.js src/hooks/useRequestMapState.js src/hooks/useWalletState.js server/index.js
• git diff --check

Not run: npm run build / npm test because npm install failed in this environment with npm registry ETIMEDOUT while fetching transitive wallet/proof packages.

Closes #68
Closes #67
Closes #66
Closes #65

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