Rename HomeController, Home page, and V5HomeProps type to Dashboard
equivalents. Update route name from 'home' to 'dashboard'.
Add coollabs brand color tokens to CSS theme and a 'coolify' button
variant using those colors. Add Sheet UI component for slide-over panels.
Update navbar with active-route detection and Sheet-based mobile drawer.
Switch cluster action buttons to use the new 'coolify' variant.
