Added model sizes

[sherucon]

Model Size Display Enhancement

Overview

This PR implements a new feature to display model file sizes right next to model names throughout the OpenSuperWhisper UI, providing users with clear information about the storage requirements of each model they can download.

Closes #143.

Key Features

✅ Onboarding Screen

Model sizes are now displayed in the onboarding view (OpenSuperWhisper/Onboarding/OnboardingView.swift), showing accurate file sizes below each model description.

✅ Settings Model Selection

Model sizes are displayed in the model selection screen within settings (OpenSuperWhisper/Settings.swift), providing storage information for downloadable Whisper and Parakeet models.

Model Sizes Displayed

Model	Size (MB)	Type
Whisper V3 Large	1,624	Whisper
Whisper Medium	874	Whisper
Whisper Small	574	Whisper
Parakeet v3	483	Parakeet
Parakeet v2	464	Parakeet

Technical Improvements

1. Unified Model Size Storage

• Removed redundant size field from OnboardingModelType enum
• Consolidated all model sizes in OnboardingUnifiedModel struct
• Follows the same pattern as SettingsDownloadableModel for consistency

2. Accurate Parakeet Model Sizes

• Parakeet v3: 483 MB
• Parakeet v2: 464 MB
• Sizes based on actual FluidAudio download analysis (detailed in parakeet_download_analysis.md)

3. Fixed Compiler Issues

• Resolved pattern matching errors in OnboardingView.swift
• Changed .whisper(let url, _) to .whisper(let url) to match the updated enum definition

Implementation Details

Files Modified:

1. OpenSuperWhisper/Onboarding/OnboardingView.swift

   • Fixed compiler errors
   • Added size display in OnboardingUnifiedModelItemView

2. OpenSuperWhisper/Settings.swift

   • Refactored OnboardingModelType enum
   • Added sizes to OnboardingUnifiedModels collection
   • Updated ModelDownloadItemView to display sizes

Pattern Used:

• Size is stored as Int representing MB
• Uses ByteCountFormatter for display (same as existing codebase)
• Computed property sizeString formats for user display

Analysis Documentation

For detailed information about Parakeet model download sizes, see parakeet_download_analysis.md:

• Key Finding: FluidAudio selectively downloads only required components
• Result: ~2.99 GB repo → 483 MB actual download (v3)
• Impact: Much more storage-efficient than assumed

Benefits

User Experience:

1. Better Decision Making: Users can see storage requirements before downloading
2. Transparency: Clear information about model sizes
3. Planning: Helps users manage device storage effectively

Code Quality:

1. DRY Principle: Single source of truth for model sizes
2. Consistency: Matches existing SettingsDownloadableModel pattern
3. Maintainability: Easier to update model sizes in one place
4. Accuracy: Parakeet sizes now reflect actual download sizes

Testing

Manual verification completed:

• ✅ Model sizes display correctly in onboarding
• ✅ Model sizes display correctly in settings
• ✅ Parakeet models show accurate sizes (464-483 MB)
• ✅ Whisper models show correct sizes (574-1,624 MB)
• ✅ UI updates correctly when model is selected

Future Considerations

• Could be extended to show actual file size after download completion
• May add storage usage calculations for disk space planning
• Could provide download progress estimates based on model size