Changes

• Settings:

• Input field for hex value of model colour

• Explore:

• Source tree starts expanded
• Collection highlighting works
• Tags must start with a non-space character (can't have an empty tag)
• Setting cover image correctly updates

• Details:

• Show cover image if no preview is selected

• Import:

• Library tree starts expanded
• Refresh folder correctly handles deleted folders on disk
• Tags refresh after import, to ensure consistency of autocomplete