Draft: Save State - Fix #235 - #238

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, actions/checkout@v4, actions/setup-node@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

public/sw-mesh.js:11:35: Parameter 'event' is declared but never used. Unused parameters should start with a '_'.

public/sw-mesh.js:6:7: Variable 'SW_VERSION' is declared but never used. Unused variables should start with a '_'.

src/context/IndexerModeContext.tsx:104:17: Fast refresh only works when a file only exports components. Use a new file to share constants or functions between components.

src/context/WalletContext.tsx:247:14: Fast refresh only works when a file only exports components. Use a new file to share constants or functions between components.

src/context/ThemeContext.tsx:79:17: Fast refresh only works when a file only exports components. Use a new file to share constants or functions between components.

src/hooks/useOptimisticRollup.ts:64:58: React Hook useMemo has unnecessary dependency: state

src/hooks/useOptimisticRollup.ts:64:35: React Hook useMemo has a missing dependency: 'engine'

src/hooks/useOptimisticRollup.ts:63:60: React Hook useMemo has unnecessary dependency: state