Rebrand: polkadot → pezkuwi build fixes

- Fixed TypeScript type assertion issues
- Updated imports from api-augment/substrate to api-augment/bizinikiwi
- Fixed imgConvert.mjs header and imports
- Added @ts-expect-error for runtime-converted types
- Fixed all @polkadot copyright headers to @pezkuwi

web/src/pages/Elections.tsx

@@ -47,7 +47,7 @@ import {
   type CandidateInfo,
 } from '@pezkuwi/lib/welati';
 // import { handleBlockchainError, handleBlockchainSuccess } from '@pezkuwi/lib/error-handler';
-// import { web3FromAddress } from '@polkadot/extension-dapp';
+// import { web3FromAddress } from '@pezkuwi/extension-dapp';
 
 export default function Elections() {
   const { api, isApiReady } = usePolkadot();