Roos-fs-ZIP

User Story:
As a user, I want to see a separate page listing all leads in the system.

Acceptance Criteria:

• "Leads" is added as a menu item on the left sidebar
• A paginated, searchable table lists all leads with key fields (e.g., name, company, last updated (if anything was added like note, comment), created at)
• Columns can be sorted and filtered
• Import button is visible and calls a designated function
• manual creation of the leadr button with the respected function is visible