Implement Conjugate App Scribe-Server data download functionality (#565)

[prince-0408]

Summary

This PR implements the Conjugate App Scribe-Server data download functionality as requested in issue #565. The implementation allows the Conjugate app to download only verb data (instead of full language data) while maintaining shared infrastructure with the Keyboard app.

Key Changes

• Verb-only downloads: Conjugate app downloads only verbs, reducing download size and storage requirements
• Separate databases: Creates {LANG}ConjugateData.sqlite files containing only the verbs table
• Independent state tracking: Uses separate SharedPreferences (scribe_conjugate_prefs) to track conjugate-specific updates
• Shared API infrastructure: Reuses existing /data/{lang} endpoint but filters for verb data only

Files Added

• ConjugateDataDownloadViewModel.kt - Specialized ViewModel for conjugate data downloads
• ConjugateDynamicDbHelper.kt - Database helper for verb-only databases

Files Modified

• App.kt - Integrated conjugate-specific download actions and ViewModels
• DatabaseFileManager.kt - Added getConjugateDatabase() method
• ConjugateDataManager.kt - Updated to use conjugate-specific databases

Implementation Details

• Database Separation: Keyboard app uses {LANG}LanguageData.sqlite (all data), Conjugate app uses {LANG}ConjugateData.sqlite (verbs only)
• State Management: Independent download state tracking prevents conflicts between apps
• API Integration: Uses existing Scribe-Server endpoints with client-side filtering for verbs
• Data Contracts: Downloads and uses the same YAML contracts for conjugation patterns

Testing

• ✅ Successfully tested with English verb data download
• ✅ Verified separate database file creation
• ✅ Confirmed UI state updates and progress indicators
• ✅ Tested conjugateDebug build variant functionality

Resolves

• Add Conjugate App Scribe-Server data download functionality #565 - Add Conjugate App Scribe-Server data download functionality

Note

This implementation builds on the UI foundation from issue #564 and maintains compatibility with existing Keyboard app functionality while providing optimized verb-only downloads for the Conjugate app.

Screenshots

Conjugate App Main Screen

Download Screen - After English Download

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  • Tests may need to be reran as they're at times not deterministic

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