feat: dashboard UI improvements - 8 changes

1. Web CAD title larger (24px, font-weight 800)
2. Gear icon opens SettingsModal
3. Folder drag-and-drop with nested folders (backend parent_id support)
4. Icon-only card buttons with CSS tooltips
5. Canvas preview (deterministic SVG per project)
6. Info panel: smaller title, double-height description
7. User/group permission selector
8. oe → ö correction

frontend/package-lock.json

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