Redesign project detail page with header tabs and overview
- Replace sidebar layout with top header: project icon, name, Discussion (purple) and Invite buttons
- Add metadata bar: role, creation date, status badge, progress bar
- Tab navigation: Aperçu, Tâches, Fichiers, Discussion, Événements, Roadmap (bientôt)
- Overview tab: project description card, tasks preview (5 items), files sidebar, project info card
- Other tabs delegate to existing section components (TabloTasksSection, TabloFilesSection, etc.)
- Move /tablos/:tabloId route inside Layout wrapper so it gets the sidebar and TopBar
- Purple #804EEC accent throughout, full dark mode support
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
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