feat: add WalletConnect v2 integration for mobile wallet connection

- Add @walletconnect/sign-client for dApp-side WC v2 support
- Create walletconnect-service.ts with session management and Signer adapter
- Create WalletConnectModal.tsx with QR code display
- Update PezkuwiContext with connectWalletConnect(), session restore, walletSource tracking
- Update WalletContext signing router: mobile → WalletConnect → extension
- Update WalletModal with "Connect with pezWallet (Mobile)" button
- Move WalletConnect projectId to env variable
- Fix vite build: disable assetsInclude for JSON (crypto-browserify compat)

web/package.json

@@ -60,6 +60,8 @@
     "@types/dompurify": "^3.0.5",
     "@types/react-syntax-highlighter": "^15.5.13",
     "@types/uuid": "^10.0.0",
+    "@walletconnect/sign-client": "^2.23.6",
+    "@walletconnect/types": "^2.23.6",
     "buffer": "^6.0.3",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",