feat(wallet): Production-ready wallet with real blockchain integration

Wallet Features:
- Fix address encoding (48 byte → 32 byte) for chain queries
- Add gas fee preview before sending transactions
- Add address validation with error display
- Add real-time balance via chain subscription
- Add address book (save/load frequently used addresses)
- Add balance check before send (insufficient funds warning)
- Use transferKeepAlive to prevent account reaping

UI/UX:
- Browser title: "Pezkuwi Wallet" → "Pezkuwi"
- Update favicon from shared/images
- Standardize token logos (hez_token_512.png, pez_token_512.png)

Infrastructure:
- Fix zombienet endpoint: wss://beta-rpc.pezkuwichain.io:19944
- Disable indexer API (not production ready yet)
- Optimize logo images for mobile (5MB → 300KB)

shared/constants/index.ts

@@ -55,14 +55,14 @@ export const KNOWN_TOKENS: Record<number, TokenInfo> = {
     symbol: 'wHEZ',
     name: 'Wrapped HEZ',
     decimals: 12,
-    logo: '/shared/images/hez_logo.png',
+    logo: '/shared/images/hez_token_512.png',
   },
   1: {
     id: 1,
     symbol: 'PEZ',
     name: 'Pezkuwi Token',
     decimals: 12,
-    logo: '/shared/images/pez_logo.jpg',
+    logo: '/shared/images/pez_token_512.png',
   },
   1000: {
     id: 1000,