Remove resource calendar mode support

Simplifies calendar configuration and removes resource-specific code paths

Eliminates complexity around resource-based calendar rendering by:
- Removing ResourceCalendarData type
- Removing resource-specific renderers and managers
- Streamlining event and grid management logic
- Consolidating to single date-based calendar implementation

wwwroot/css/calendar-layout-css.css

@@ -186,7 +186,6 @@ swp-calendar-header {
   min-width: calc(var(--grid-columns, 7) * var(--day-column-min-width));
   /* Dynamic width */
   background: var(--color-surface);
-  border-bottom: 1px solid var(--color-border);
   position: sticky;
   top: 0;
   z-index: 3;
@@ -197,10 +196,7 @@ swp-calendar-header {
   /* Force scrollbar to appear for alignment */
   overflow-y: scroll;
   overflow-x: hidden;
-
-  /* Firefox - hide scrollbar but keep space */
-  scrollbar-width: auto;
-  /* Normal width to match content scrollbar */
+ 
 
   /* All-day events container */
   swp-allday-container {
@@ -211,12 +207,10 @@ swp-calendar-header {
     grid-auto-rows: var(--single-row-height);
     /* Each row is exactly SINGLE_ROW_HEIGHT */
     gap: 2px 0px;
-    padding: 2px 0px 5px 0px;
     align-items: center;
     overflow: hidden;
   }
-
-  scrollbar-color: transparent transparent;
+ 
 }
 
 /* WebKit browsers (Chrome, Safari, Edge) - hide scrollbar but keep space */