Wysiwyg editing

### Description

Dashboard WYSIWYG Editing eipc

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate
```[tasklist]
### Tasks
- [x] WYSIWYG: Group Sizing and re-ordering (done #1369 )
- [x] WYSIWYG: Add ui-spacer (done #1430)
- [ ] https://github.com/FlowFuse/node-red-dashboard/issues/1468
- [ ] https://github.com/FlowFuse/node-red-dashboard/issues/1479
- [ ] https://github.com/FlowFuse/node-red-dashboard/issues/1481
- [ ] WYSIWYG: Ability to edit basic properies of a page (theme choice, page name, icon, class)
- [ ] WYSIWYG: Ability to edit basic properies of a group (name, class)
- [ ] WYSIWYG: Ability to edit page breakpoints
- [ ] https://github.com/FlowFuse/node-red-dashboard/issues/1484
```

2024-12-13: Added `#1484` to task list. It may be we don't do anything with it, but wanted here for tracking.