fix(calendar): update indigo theme border styles for selected+current dates

- Add new border color for selected+current dates.
- Update hover and focus border color variables for consistency.

Author: desig9stein

src/components/calendar/themes/shared/indigo/days-view.indigo.scss

@@ -326,6 +326,7 @@ $week-number-radius: var-get($theme, 'week-number-border-radius');
     &[part~='selected'][part~='current'][part~='range'][part~='last'] {
         color: var-get($theme, 'date-selected-foreground');
         background: var-get($theme, 'date-selected-background');
+        border-color: var-get($theme, 'date-selected-current-border-color');
 
         &::after {
             border-color: transparent;
@@ -334,13 +335,13 @@ $week-number-radius: var-get($theme, 'week-number-border-radius');
         &:hover {
             color: var-get($theme, 'date-selected-hover-foreground');
             background: var-get($theme, 'date-selected-hover-background');
-            border-color: var-get($theme, 'date-current-hover-border-color');
+            border-color: var-get($theme, 'date-selected-current-hover-border-color');
         }
 
         &:focus {
             color: var-get($theme, 'date-selected-focus-foreground');
             background: var-get($theme, 'date-selected-focus-background');
-            border-color: var-get($theme, 'date-current-focus-border-color');
+            border-color: var-get($theme, 'date-selected-current-focus-border-color');
         }
     }