Improves calendar event rendering and data

Updates mock event data to reflect a more recent week and includes events spanning early/late hours.

Enhances event rendering by adjusting the top and height styles for better visual appearance.

Refactors CSS to improve grid line display and event hover effects, and moves hour marker styles to a more appropriate CSS file.

Provides default fallback values for time boundaries using CSS variables.

wwwroot/css/calendar-events-css.css

@@ -37,7 +37,7 @@ swp-event {
 
 swp-event:hover {
   box-shadow: var(--shadow-md);
-  transform: scale(1.02);
+  filter: brightness(0.95);
   z-index: 20;
 }