[Crazy RoboTaxi] Assign spawns to race courses, add first frame thumbnails to map/course selection screens

[aidanfnv]

Split off from #553, this change makes it so that each race course in a map has a spawn associated with them instead of using the map's default spawn, and adds each course's spawn point's first frame to the course selection screen as a thumbnail preview. It does the same with the map selection screen using the default spawn's first frame.

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[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no outstanding previous findings or accepted new issues.

Summary

This PR assigns an authored spawn to each race course and uses spawn imagery for map and course selection previews.

• Extends map schema, headers, runtime types, serialization, and documentation with course spawn metadata and optional map thumbnails.
• Compiles and caches spawn-specific scenes, then selects the course’s spawn when starting a race.
• Adds thumbnail-backed map and course grids with responsive sizing and horizontal scrolling.
• Updates bundled maps and tests for schema validation, scene selection, discovery, and UI layout.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Robotaxi map YAML] --> B[Load map header]
    B --> C[Map menu thumbnail]
    B --> D[Race-course metadata]
    D --> E[Course spawn ID]
    D --> F[Spawn image thumbnail]
    C --> G[Map selection grid]
    F --> H[Course selection grid]
    H --> I[GameSelection]
    I --> J[SceneRequest with spawn ID]
    J --> K[Compile spawn-specific archive]
    K --> L[Load race scene at course spawn]

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_{Reviews (7) · Last reviewed commit: "[crazy-robotaxi] Fix UI test import orde..."}

[aidanfnv]

/ok to test dfa64d9

[aidanfnv]

/ok to test cf49060

[aidanfnv]

/ok to test 232bacb