feat: add opt-in telemetry with Plausible and privacy page

[lamborghini21]

Closes #73

What this adds

• Plausible Analytics (cookieless) integrated via script tag in index.html
• Opt-in banner on first visit, consent remembered in localStorage
• src/lib/telemetry.ts — consent management + trackPageView / trackEvent helpers
• src/pages/Privacy.tsx — public privacy page at /privacy describing what is collected
• Events tracked: connect_wallet, send_submitted, scan_triggered, withdraw across all 4 chains
• No PII collected — no wallet addresses, no amounts

Files changed

• New: src/lib/telemetry.ts
• New: src/pages/Privacy.tsx
• New: src/components/TelemetryBanner.tsx
• Modified: src/App.tsx — added /privacy route and banner
• Modified: src/components/WalletConnect.tsx — connect_wallet event
• Modified: src/components/HorizenSend.tsx, StellarSend.tsx, SolanaSend.tsx, CkbSend.tsx — send_submitted event
• Modified: src/components/HorizenReceive.tsx, StellarReceive.tsx, SolanaReceive.tsx, CkbReceive.tsx — scan_triggered / withdraw events
• Modified: src/pages/Send.tsx, Receive.tsx — trackPageView calls
• Modified: index.html — Plausible script tag

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[truthixify]

Clean merge. Opt-in Plausible telemetry + privacy page + per-component event hooks (3-7 line touches). Thanks @lamborghini21 (4th merge this wave!).