feat(pwa): add service worker, manifest, and offline banner (#103)

[Meme11030]

• Install vite-plugin-pwa@0.21.1 + workbox packages
• Add public/manifest.webmanifest with full PWA metadata
• Generate 10 icon sizes (72–512px) including maskable variants for Android adaptive icons and iOS home screen
• Create src/sw/app-sw.ts: unified service worker that merges Workbox precaching/routing with existing Stellar notification background sync (replaces manual stellar-notification-sw.ts reg)
• Configure injectManifest strategy:
  • NetworkFirst for Stellar RPC, Horizen RPC, Horizon REST
  • CacheFirst for Google Fonts (CSS + files)
  • Precache 198 app assets (4 MiB limit for large SDK chunks)
• Add src/components/OfflineBanner.tsx: accessible offline state indicator using navigator.onLine + online/offline events
• Wire OfflineBanner into App.tsx layout (between Header and TelemetryBanner)
• Update index.html: manifest link → /manifest.webmanifest, dual theme-color meta (dark/light), iOS PWA meta tags
• Remove manual SW registration from main.tsx (handled by injectRegister: auto via registerSW.js)
  closes PWA + service worker (offline-friendly) #103

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[truthixify]

build failing on prettier drift in src/sw/app-sw.ts. Run pnpm format and push.

[truthixify]

The build job fails at pnpm install --frozen-lockfile, which means pnpm-lock.yaml in your PR does not match package.json. Run pnpm install locally (which updates the lockfile) and commit the updated pnpm-lock.yaml.

[Meme11030]

@truthixify i have fixed it please merge my pr and i look forward working with you in the next wave
i really appreciate
much gratitude