Adds department view to calendar application

Introduces department-level grouping and rendering in the calendar view

Extends the application to support:
- Department-based resource filtering
- Dynamic department header rendering
- Mock department data infrastructure

Enables more granular organizational views

wwwroot/v2.html

@@ -14,6 +14,7 @@
         <swp-nav-button id="btn-simple">Datoer</swp-nav-button>
         <swp-nav-button id="btn-resource">Resources</swp-nav-button>
         <swp-nav-button id="btn-team">Teams</swp-nav-button>
+        <swp-nav-button id="btn-department">Departments</swp-nav-button>
         <swp-week-info>
           <swp-week-number>V2</swp-week-number>
           <swp-date-range id="view-info"></swp-date-range>