feat(perf): implement advanced performance optimization with code spl…

[Malik6828]

…itting (#450)

• vite.config.js: add build.target=es2020, cssCodeSplit, esbuild minify, assetsInlineLimit=4096, drop debugger in prod, resolve extensions for .js→.ts compat, zustand+react-router in react-vendor chunk
• src/hooks/usePreload.ts: new preloadTab() / usePreload hook that triggers dynamic imports on nav hover (prefetch-on-hover)
• src/components/layout/Sidebar.tsx: call preloadTab(id) on onMouseEnter for every nav button so chunks are fetched before the user clicks
• .github/workflows/ci.yml: replace single 500 KB main-chunk check with per-chunk budgets (main 50 KB, vendor 500 KB, stellar-sdk 800 KB) and a 2 MB total-JS gzip budget; report all chunks in step summary
• Fix pre-existing broken imports that blocked the build:
  • UserPreferences: AccessibilitySettings wrong relative path
  • offline.js: ./logger.js → ./logger (resolves to .ts)
  • stateSync.js: add missing syncState / onStateChange exports
  • stellar.ts: add fetchAccountDetails / AccountDetails / isPublicKey aliases
  • payments.ts: new shim re-exporting fetchPaymentPaths as fetchPathPayments
  • WalletConnect: fix Card named→default import

closes #450

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