Add Pavel visual controls, presets, and Augmenta debug overlays

[Lyptik]

Summary

Expands the Visuals section around the PavelDoGreat fluid renderer and reorganizes the former Display / Live debug controls.

Visuals

• adds the same interactive controls exposed by the Pavel web demo, excluding Capture:
  • Quality / dye resolution
  • Sim resolution
  • Density diffusion
  • Velocity diffusion
  • Pressure
  • Vorticity
  • Splat radius
  • Shading
  • Colorful
  • Paused
  • Random splats
  • Bloom enabled / intensity / threshold
  • Sunrays enabled / weight
• adds a preset system
  • current values are Default
  • edited values automatically become Custom
  • selector is data-driven so future named presets can be added without changing UI logic

Augmenta splat input

Adds Visuals → Augmenta → Splat input:

• Centroid: one standard-radius splat per cluster centroid
• Point clouds: current bounded/subsampled multi-splat point-cloud input
• Bounding box: one centroid splat with a radius derived from the projected bounding-box footprint

All modes use the same Pavel splat pipeline and point/centroid motion, with cluster velocity as fallback when correspondence is unstable.

Augmenta data

• removes the standalone Display section
• renames Live debug data to Augmenta data
• moves scene selection, Reset camera, Clusters, Point clouds, Scenes, Zones and Velocity vectors into that section
• renders the Three.js debug viewer transparently above the fluid canvas so enabled data overlays remain visible without replacing the fluid visuals
• scene grid/axes now follow the Scenes toggle too

Persistence / compatibility

• persists the full visual configuration
• migrates old display preferences into the new data preference block
• preserves the old debug-section open state
• keeps device-specific Pavel defaults (e.g. mobile/no-linear-filtering fallbacks) as the runtime Default preset

Validation

• adds tests for bounding-box radius mapping, control presence, splat-input modes, fluid control API, and transparent debug layering
• version bumped to 0.4.0