fix(mobile): collapse HUDs so the track stays clear at 320px

[shaal]

Summary

Phone-width layout (≈320px) was burying the track under stacked chrome: metrics HUD + cinema HUD/story, the phase banner, the full Follow/3D/Trails/Heat/Rays/Demo chip row, and help FABs.

Changes (≤480px)

• Hide #metrics-hud (duplicates cinema stats)
• Compact cinema HUD to Gen / Alive / Best; hide story + Laps/Sim chips
• Hide #bottomText phase banner
• Collapse cinema view chips behind a Views / Hide toggle (default collapsed)
• Move help FABs to a smaller top-right stack
• Top-align the 16:9 canvas so overlays sit on the frame instead of empty space above a centered track

Validation

• agent-browser viewport 320×700: metrics display: none, only Views visible until expanded, canvas top-aligned, FABs at top-right

Test plan

• agent-browser @ 320×700 before/after screenshots
• Views expand shows Follow/3D/Trails/Heat/Rays/Demo
• Hard-refresh on a real phone and confirm track is readable mid-training
• Desktop (≥481px) still shows full cinema chips with no Views toggle

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: c214a49e-1a77-4f79-a714-838138a9b355

📥 Commits

Reviewing files that changed from the base of the PR and between 057f3c3 and dc1e8a7.

📒 Files selected for processing (2)

• AI-Car-Racer/demoPresentation.js
• AI-Car-Racer/style.css

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/mobile-narrow-hud-collapse

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