[BrushGraph 7/7] Integrate Brush Graph into the app

[maxmmitchell]

Description

This is the final PR in the Brush Graph stack. It ties all the components together and integrates the feature into the main application navigation and resource files.

Details

• Navigation routes and menu configurations.
• Mapping Proto enums to localized string resources at the edge of the UI (in DisplayTextExtensions).
• Adding the Brush Graph Studio to the existing CahierNavGraph, as a default-on toggle which controls whether the "Launch" button next to Brush Designer leads to tab-based or graph-based view.
• Action menu and FAB/SpeedDial for key actions.
• Notification pane for viewing errors in the UI.
• Tutorial UI elements for displaying the tutorial text to the user.
• Brush graph entry point from Cahier notes ("Edit active brush")
• Some misc. cleanup of code.

Dependencies

• Target: brush-graph/6-canvas

[gemini-code-assist]

Code Review

This pull request introduces a comprehensive "Brush Graph" feature, a node-based visual designer for ink brushes. It includes a new navigation destination, a complex UI with canvas, inspector, and notification panes, and a tutorial system. Key technical changes include the addition of an ExtendedColorScheme for warning states, Hilt injection for the texture store, and autosave functionality in the drawing canvas. Review feedback highlights critical issues with texture serialization due to incorrect store instantiation, potential UI freezes from blocking I/O on the main thread, and opportunities for code cleanup regarding unused parameters and magic strings.