Floating navigation: not using data-attribute hooks for theming

[jerrythomas]

Problem

The floating navigation component visible at /preview/reports (bottom right) does not appear to use the standard data-* attribute hooks that all other components rely on for theme CSS.

Expected

All components should use consistent data-* attribute hooks (e.g. data-floating-nav, data-floating-nav-item) so that theme CSS files can target them reliably, just like data-list, data-button, data-card, etc.

Impact

Without data-attribute hooks, the floating navigation cannot be themed per data-style — it will either inherit unstyled defaults or rely on class-based CSS that conflicts with the architecture.

Steps to Reproduce

1. Navigate to /preview/reports
2. Inspect the floating navigation element in the bottom right
3. Observe that elements lack data-* attribute selectors used by the theme system

[jerrythomas]

Fixed in 5ef347025939fb184a054c8a924d6d76980f5add — ThemePanel.svelte refactored to use and from @rokkit/ui so the theme system applies to all elements.