Remove cat background image from Potree viewer

[mosoriob]

Problem

The Potree viewer currently displays a cat background image, which is not appropriate for professional LiDAR data visualization. The background should be neutral and professional.

Current Behavior

• Cat image appears as background in the Potree viewer
• Unprofessional appearance for scientific/research use

Expected Behavior

• Professional, neutral background (solid color, gradient, or generic pattern)
• Background appropriate for LiDAR point cloud visualization
• Clean, distraction-free viewing experience

Tasks

• Locate and remove cat background image reference
• Replace with appropriate professional background
• Ensure new background doesn't interfere with point cloud visibility
• Test background appearance across different browsers

Files to Check

• src/ckanext-potree/ckanext/potree/templates/potree/index.html (around line 183)
• Look for background-image references in CSS styles
• Check for background image files in assets/static directories
• Potree viewer configuration files

Acceptance Criteria

• Cat background image is completely removed
• Professional background is implemented
• Background doesn't interfere with point cloud visualization
• Consistent appearance across different browsers and devices

Suggested Replacement

• Solid dark background (#2c3e50 or similar)
• Subtle gradient background
• Remove background-image property to use default Potree background