Now I need to update the types to include company information and add mock data with company-linked ListTypes. Then I'll update the page with tabs.

Now let's update the main page to add tabs:

Now let's create the CompanyListTypeManager component:

Now let's update the header to conditionally show the source filter:

I've added a new "Par entreprise" (By Company) tab that displays ListTypes grouped by company. The implementation includes:

• Tabs navigation: Switch between "Par groupe" (system lists grouped by category) and "Par entreprise" (company-specific lists grouped by company name)
• Company grouping: Each company appears as a collapsible section showing its logo icon, name, and stats (number of lists and total items)
• Consistent UX: Both views share the same editing dialogs for ListTypes and ListItems
• Smart filtering: The source filter dropdown is hidden when viewing company lists (since they are all custom by definition), but the search still works across company names, list names, and groups

These diagnostic outputs are not actual runtime errors or exceptions - they appear to be browser extension attributes (jf-ext-button-ct) being logged, likely from a form-filling or accessibility browser extension. The preview is working correctly and no code changes are needed.

Now let me read more components to understand the full UI and then improve the design:

Now I have a full understanding of the codebase. Let me improve the design with a more polished, professional dark-themed look inspired by the Vercel dashboard design. I'll update the components with better shadows, refined spacing, and modern aesthetics.

Now let me update the header component with a more polished design:

Now let me update the edit list item dialog with an improved design:

I've significantly improved the overall design of the admin interface with:

Theme Updates:

• Refined color palette with a cohesive blue primary and warm amber accents
• Better color contrast and hierarchy using oklch color space
• Added Inter font for better readability and JetBrains Mono for code/tags
• New utility classes for glass effects and soft shadows

UI Improvements:

• Header with gradient logo icon, blur backdrop, and expanding search input
• Cards with subtle shadows, refined borders, and smooth hover transitions
• Improved tab design with counters showing totals
• Better spacing and typography hierarchy throughout
• Dropdown menus for row actions instead of always-visible buttons
• More polished badges with consistent sizing and colors
• Empty states with larger icons and better messaging
• Dashed border buttons that highlight on hover

The interface now has a modern, professional look inspired by enterprise dashboards like Vercel, with clean lines, subtle shadows, and thoughtful micro-interactions.

These diagnostics are not actual runtime errors. The jf-ext-button-ct attributes are being injected by a browser extension (likely a form-filling or accessibility tool) and are not part of the application code. The preview is working correctly and no code changes are needed.