Large v0.2 feature update:

• Add procedural asset/build pipeline and generated blobs (public/models, public/sounds) plus build scripts (scripts/build-models.mjs, build-sounds.mjs) and package.json build task.
• Central loaders + preload (src/loaders.js) with audio/model fallbacks; service worker for offline (public/sw.js).
• Missions, scoring and unlock system (src/missions.js, src/unlocks.js), persist mission history (src/save.js).
• Touch controls + joystick, HUD improvements, console flash, crosshair, result sharing UI, ErrorBoundary.
• Audio rework to prefer predecoded buffers with synth fallback, renderer/rocket/load integration and misc fixes.

Still need to fix the button / UI glitch