close(spaxel-trsm): Make expert mode mobile-responsive

Implemented mobile touch controls for expert mode 3D scene:

- OrbitControls touch gesture configuration:
  - ONE: THREE.TOUCH.ROTATE (one-finger orbit)
  - TWO: THREE.TOUCH.DOLLY (pinch zoom ONLY, no accidental pan)
  - THREE: THREE.TOUCH.PAN (three-finger pan)

- Mobile-specific touch handling improvements:
  - CSS touch-action: none on scene container and canvas
  - -webkit-touch-callout: none
  - -webkit-user-select: none
  - user-select: none
  - -webkit-tap-highlight-color: transparent

- iOS Safari-specific touch improvements:
  - Double-tap zoom prevention
  - Visual viewport handling for orientation changes

All 29 mobile tests pass. Implementation already committed in ef9cd3f.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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