Greptile Summary

Added text size adjustment feature accessible via overflow menu in conversation view. Users can scale message text from 70% to 200% with a slider dialog that includes live preview and reset functionality. The font scale is persisted in DataStore and flows reactively through the ViewModel to the UI layer.

• Added MESSAGE_FONT_SCALE preference with proper range clamping (0.7f-2.0f)
• Implemented TextSizeDialog composable with slider, live preview, and reset button
• Applied font scaling to LinkifiedMessageText by multiplying bodyLarge.fontSize by the scale factor
• Updated all test files with appropriate mocks for the new flow

The implementation follows proper Jetpack Compose patterns with StateFlow lifecycle management and reactive UI updates. The slider has 13 steps (12 intermediate + 2 endpoints) covering the full range smoothly.

Confidence Score: 5/5

• This PR is safe to merge with no issues found
• Well-structured feature implementation with proper state management, range validation, test coverage, and clean separation of concerns across repository, ViewModel, and UI layers
• No files require special attention

Important Files Changed

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[User taps ⋮ menu] --> B[Opens overflow menu]
    B --> C[User selects 'Text size']
    C --> D[TextSizeDialog opens]
    D --> E[User adjusts slider 0.7-2.0]
    E --> F[Preview updates in real-time]
    F --> G{User action?}
    G -->|OK| H[viewModel.saveMessageFontScale]
    G -->|Reset| I[Set scale to 1.0f]
    H --> J[SettingsRepository.saveMessageFontScale]
    I --> J
    J --> K[DataStore persists scale value]
    K --> L[messageFontScaleFlow emits new value]
    L --> M[MessagingViewModel.messageFontScale updates]
    M --> N[MessagingScreen observes via collectAsStateWithLifecycle]
    N --> O[MessageBubble receives fontScale]
    O --> P[LinkifiedMessageText applies scale]
    P --> Q[Text fontSize = bodyLarge.fontSize × fontScale]

_{Last reviewed commit: 46ade88}

Codecov Report

✅ All modified and coverable lines are covered by tests.

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