Tron visual overhaul: fog, TronWall shader, HUD, minimap

[AndrewAltimit]

Summary

• Distance fog: objects beyond 50 units fade to black, creating Armagetron-style atmosphere (disabled for non-Tron games)
• TronWall shader: new fragment shader with dim body + bright top-edge highlight for trail walls and arena boundaries
• Camera tuning: lower (6 units), closer (12 behind), wider FOV (70deg), longer look-ahead (30 units)
• Player name labels: 3D-to-screen projected names floating above each cycle with neon glow
• Minimap: bottom-center 2D canvas showing wall segments and cycle positions
• Speed/rubber/brake gauges: bottom-left bars for local player
• Grid lines: hair-thin (0.08) semi-transparent Unlit material instead of thick Glow
• Cycle sizing: smaller, sleeker bodies (0.8x1.5x2.0 vs 1.2x2.5x3.0)

Files changed (15)

• 5 GLSL shaders modified + 1 new (tronwall.frag)
• 6 Rust files (app.rs, bridge.rs, camera_gl.rs, tron_render.rs, renderer.rs, scene.rs)
• 3 web files (index.html, style.css, ui.js)

Test plan

• cargo fmt --all -- --check passes
• cargo clippy --workspace --all-targets -- -D warnings passes
• cargo test --workspace passes (527 tests)
• wasm-pack build succeeds
• Visual test: create Tron room, verify fog fades distant objects to black
• Visual test: trail walls show bright top-edge highlight
• Visual test: player names float above cycles
• Visual test: minimap renders at bottom-center with wall lines and cycle dots
• Visual test: speed/rubber/brake gauges appear for local player
• Regression: non-Tron games unaffected (fog_density=0)

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