- Add StarfieldConfig interface (count, radius, brightness, pointSize)
- Add scale property to SunConfig for independent x/y/z scaling
- Update levelDeserializer to apply sun scale and expose starfield config
- Update level1 to pass starfield config to BackgroundStars
- Create SunConfigEditor.svelte for editing sun properties
- Create StarfieldConfigEditor.svelte for editing starfield properties
- Add Sun and Stars tabs to LevelConfigEditor
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Co-Authored-By: Claude <noreply@anthropic.com>