Add unit tests for WardrobeViewModel and WardrobeRepositoryImpl

[jvsena42]

Summary

Add comprehensive unit tests for the app's core business logic (WardrobeRepositoryImpl) and MVI ViewModel (WardrobeViewModel). This establishes the test infrastructure with Turbine for Flow testing and MockK for mocking concrete dependencies.

Changes

• Add Turbine 1.2.1 and MockK 1.14.9 test dependencies
• Enable withHostTestBuilder on the Android KMP target for JVM-based tests
• Add 14 WardrobeViewModel tests in commonTest covering all MVI intents, state transitions, and side effects
• Add 12 WardrobeRepositoryImpl tests in androidHostTest using MockK to mock DB, file storage, and AI client
• Create reusable test fakes: FakeWardrobeRepository, FakeSecretStore, and TestData factory

Test plan

• Run ./gradlew :shared:allTests — all 26 tests pass
• Run ./gradlew detekt — no violations

Checklist

• ./gradlew detekt passes
• Tested on Android
• Tested on iOS
• Updated documentation (if applicable)

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