Kelsi 36dc9ddef7 feat(editor): PNG/JPG/BMP heightmap image import, undo for all imports ...

- importHeightmapImage(): loads any resolution PNG/JPG/BMP/TGA via
  stb_image, supports both 8-bit and 16-bit precision, maps to terrain
  vertices with bilinear coordinate mapping
- Both image import and RAW import now wrapped with undo
  (recordGeneratorUndo/commitGeneratorUndo)
- UI: File > Import Heightmap now offers "Import Image" (any format)
  and "Import RAW" (binary) as separate options
- Enables professional terrain workflows: paint in Photoshop/GIMP,
  generate in World Machine/Gaea, import directly as terrain

2026-05-05 15:42:35 -07:00

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