Refactor custom brush IDs and fix music brush texture rendering

[cka-dev]

fixes #13

[gemini-code-assist]

Summary of Changes

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This pull request refactors the internal identification mechanism for custom brushes, standardizing on the name property of CustomBrush objects. Concurrently, it introduces a dedicated texture bitmap store to correctly load and apply textures for custom brushes, resolving a rendering issue, particularly for music-themed brushes. These changes ensure consistent brush behavior and visual fidelity across the application.

Highlights

• Custom Brush ID Refactoring: The identification mechanism for custom brushes has been refactored, moving from using clientBrushFamilyId on the BrushFamily to the name property of the CustomBrush object itself for serialization and deserialization.
• Texture Bitmap Store Introduction: A new component, CahierTextureBitmapStore, has been introduced to manage and provide texture bitmaps for custom brushes, specifically addressing the rendering of music-themed brushes like 'music-clef-g' and 'music-note-sixteenth'.
• Integrated Texture Rendering: The CanvasStrokeRenderer initialization across various UI components (DrawingCanvas, DrawingDetailThumbnail, DrawingCanvasViewModel) has been updated to utilize the new CahierTextureBitmapStore, enabling the correct rendering of custom brush textures throughout the application.
• Fix for Music Brush Texture Rendering: These changes directly address and fix the previously reported issue (Music custom brush is not properly rendering #13) where music brush textures were not rendering correctly.

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[gemini-code-assist]

Code Review

This pull request effectively refactors the handling of custom brush identifiers by decoupling the application-specific brush name from the BrushFamily object. This is a solid architectural improvement. Additionally, it successfully introduces texture rendering for custom brushes by implementing and integrating CahierTextureBitmapStore, which resolves the issue with music brush textures. The changes are well-structured. I've identified one potential bug regarding how the brush ID is determined when saving strokes and have also suggested a performance enhancement for the new texture store. Please see my detailed comments.