Implements and tests remaining KiCad-critical wxWidgets features:
- wxPropertyGrid/wxPropertyGridManager for property panels
- wxColourPickerCtrl/wxFontPickerCtrl for color and font selection
- wxCollapsiblePane for expandable UI sections
- wxListCtrl virtual mode for large lists (10,000+ items)
- wxInfoBar for notification messages
Total: 159 tests passing across 20 standalone apps (~90% KiCad coverage)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
