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/error-handler.ts

@@ -3,8 +3,8 @@
 // ========================================
 // Convert blockchain errors to human-readable messages
 
-import type { ApiPromise } from '@polkadot/api';
-import type { DispatchError } from '@polkadot/types/interfaces';
+import type { ApiPromise } from '@pezkuwi/api';
+import type { DispatchError } from '@pezkuwi/types/interfaces';
 
 // ========================================
 // ERROR MESSAGE MAPPINGS