fix(ci): resolve lint errors and typecheck failures

[skulidropek]

This PR fixes several CI/CD issues:

• Fixed missing 'isWeb' property in AuthGeminiLoginCommand in packages/app
• Fixed ESLint errors in packages/lib (void/unknown types, template expressions, nested functions)
• Refactored complex and long functions to meet ESLint limits (complexity, max-lines-per-function, max-lines)
• Replaced switch statements with Effect Match for functional style consistency