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

shared/lib/staking.ts

@@ -3,7 +3,7 @@
 // ========================================
 // Helper functions for pallet_staking and pallet_staking_score integration
 
-import { ApiPromise } from '@polkadot/api';
+import { ApiPromise } from '@pezkuwi/api';
 import { formatBalance } from './wallet';
 
 export interface StakingLedger {