fix: TypeScript errors, shadow deprecations, and build configuration

- Fix shadow style deprecation warnings across components (boxShadow)
- Add type declaration files (codec.d.ts, modules.d.ts)
- Update metro.config.cjs for proper asset extensions
- Update tsconfig.json with module resolution settings
- Fix TypeScript errors in shared/lib files
- Update app icons (optimized PNG files)

mobile/src/contexts/PezkuwiContext.tsx

@@ -173,7 +173,7 @@ export const PezkuwiProvider: React.FC<PezkuwiProviderProps> = ({ children }) =>
         newApi.registry.setChainProperties(
           newApi.registry.createType('ChainProperties', {
             ss58Format: networkConfig.ss58Format,
-          })
+          }) as any
         );
         console.log(`✅ [Pezkuwi] API created with SS58 format: ${networkConfig.ss58Format}`);