fix(operator): use refresh icon on Refresh buttons (was chevDown)

Every page header's Refresh button rendered a downward chevron because
the icon set had no refresh glyph. Added a circular-arrow 'refresh'
icon to UiIcon and pointed all seven Refresh buttons (Overview,
Tenants, Partners, Users, Operator team, Audit, Infrastructure) at it.

apps/operator/components/UiIcon.vue

@@ -9,7 +9,7 @@ export type IconName =
   | 'search' | 'bell' | 'logout'
   | 'chevDown' | 'chevRight' | 'chevLeft' | 'chevUpDown'
   | 'arrowUp' | 'arrowDown' | 'arrowRight'
-  | 'external'
+  | 'external' | 'refresh'
 
 withDefaults(
   defineProps<{
@@ -68,5 +68,6 @@ withDefaults(
     <template v-else-if="name === 'arrowDown'"><path d="M12 5v14" /><path d="M19 12l-7 7-7-7" /></template>
     <template v-else-if="name === 'arrowRight'"><path d="M5 12h14" /><path d="M13 5l7 7-7 7" /></template>
     <template v-else-if="name === 'external'"><path d="M14 4h6v6" /><path d="M20 4l-9 9" /><path d="M19 14v5a1 1 0 0 1-1 1H5a1 1 0 0 1-1-1V6a1 1 0 0 1 1-1h5" /></template>
+    <template v-else-if="name === 'refresh'"><path d="M21 12a9 9 0 1 1-3.4-7.05" /><path d="M21 4v5h-5" /></template>
   </svg>
 </template>