Moved the 'Enable Immersive HTML' toggle from main panel to settings:
- Added toggle to settings.html with descriptive notes
- Removed from template.html to free vertical space
- Checkbox ID remains the same so existing JS still works
Benefits:
- Frees up vertical space in dashboard (was causing scrollbars)
- Users can now use full 3x7 grid instead of being limited to 3x6
- Eliminates gap beneath last widget
- Toggle is still accessible but doesn't clutter main panel
- Settings panel is the appropriate place for infrequently-changed options