refactor NoteDatabase creation to AppModule and remove redundant companion object

[cka-dev]

refactor NoteDatabase creation to AppModule and remove redundant companion object

resolves #34

[gemini-code-assist]

Summary of Changes

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This pull request refactors the application's database instantiation process. By relocating the NoteDatabase creation logic into the AppModule, it enhances modularity and improves the separation of concerns. This change also eliminates a redundant companion object from the NoteDatabase class, streamlining the codebase and making dependency management more explicit through the application's dependency injection module.

Highlights

• Database Creation Refactoring: The logic for creating the NoteDatabase instance has been moved from the NoteDatabase class itself to the AppModule.
• Redundant Companion Object Removal: The companion object within NoteDatabase.kt, which previously housed the getDatabase factory method, has been entirely removed as its functionality is now handled by AppModule.
• Dependency Management: This refactoring centralizes database dependency provision within the AppModule, aligning with best practices for dependency injection.

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[gemini-code-assist]

Code Review

This pull request effectively refactors the NoteDatabase creation by moving the logic to an AppModule and leveraging Hilt for dependency injection. This is a great improvement as it replaces the manual singleton pattern with a more robust and standard approach. The code is now cleaner and better follows modern Android architecture practices. I have one minor suggestion to further improve maintainability by extracting a hardcoded string into a constant.