Panel UI improvements:
- Replace heading elements (h1-h6) with styled divs to avoid navigation interference
- Change ContentsControl position from northwest to west for better accessibility
Panel collapse/expand enhancements:
- Fix panel dragging to prevent unexpected positioning jumps
- Keep panel width and upper-left position when collapsing to header-only mode
- Complete height reduction when collapsed (no minimal size maintained)
- Toggle resize handle visibility based on panel state
Resize handle improvements:
- Change resize symbol from arrow to clean dot (●) in bottom-right corner
- Remove background circle, show transparent dot only
- Fix resize direction to properly follow mouse movement from bottom-right
- Set dynamic minimum size constraints (header height + padding)
- Allow arbitrary panel sizing with proper bounds checking
- Reset panel size to defaults when closed/collapsed
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
tegwick
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