Integrate command zones with the client settings and theming system.
Settings integration:
- CacheSettings: persist command zone preferences
- ShortcutsSettings: keyboard shortcuts for zone actions
Theme support:
- ThemeManager: command zone background loading
- Theme assets for Fabric, Leather, Plasma, VelvetMarble themes
Visual integration:
- MessageLogWidget: command zone action logging
Theme assets provide consistent visual styling across all bundled themes.
* add button to open themes location to settings
botton creates directory if it doesn't exist yet
themes path is no longer hardcoded but included in settings
themes now default to None the default theme is no longer required
themes set to None will not look for empty directories anymore
this is backwards compatible
users with a nonexistant theme (Default) set will get the new None theme
* remove default theme from install instructions
