feat: complete Pezkuwi rebrand - remove other networks

- Remove all Polkadot ecosystem networks from chain selector
- Keep only: Pezkuwi Relay Chain, Zagros Relay Chain, Pezkuwi Beta Testnet
- Update extension ID from polkadot-js to pezkuwi
- Update PhishingDetected to use Pezkuwi branding
- Update metadataMock: Westend → Zagros, WND → ZGR
- Disable Ledger chains (no Pezkuwi Ledger app yet)
- Update Identicon to handle pezkuwi icon theme
- Clean up translation files

Breaking: Extension now only supports Pezkuwi networks

packages/extension/src/page.ts

@@ -12,7 +12,7 @@ import { packageInfo } from './packageInfo.js';
 
 function inject () {
   injectExtension(enable, {
-    name: 'polkadot-js',
+    name: 'pezkuwi',
     version: packageInfo.version
   });
 }