feat: improve captain overview loading and reuse stats for summary [CW-7610] (#15105)

app/javascript/dashboard/components-next/captain/pageComponents/overview/WelcomeCard.vue

@@ -9,6 +9,10 @@ const props = defineProps({
     type: String,
     default: '30',
   },
+  stats: {
+    type: Object,
+    default: null,
+  },
 });
 
 const route = useRoute();
@@ -20,22 +24,41 @@ const assistantId = computed(() => route.params.assistantId);
 const welcomeMarkdown = ref('');
 const isLoading = ref(false);
 
+// Increments on every fetch so a slow response for a superseded
+// range/stats/assistant can't overwrite the latest request's state.
+let fetchToken = 0;
+
 const fetchSummary = async () => {
+  fetchToken += 1;
+  const token = fetchToken;
+
+  if (!props.stats) {
+    welcomeMarkdown.value = '';
+    isLoading.value = false;
+    return;
+  }
+
   isLoading.value = true;
+  let message = '';
   try {
     const { data } = await CaptainAssistant.getSummary({
       assistantId: assistantId.value,
       range: props.range,
+      stats: props.stats,
     });
-    welcomeMarkdown.value = data.message ?? '';
+    message = data.message ?? '';
   } catch {
-    welcomeMarkdown.value = '';
-  } finally {
-    isLoading.value = false;
+    message = '';
   }
+
+  if (token !== fetchToken) return;
+  welcomeMarkdown.value = message;
+  isLoading.value = false;
 };
 
-watch([() => props.range, assistantId], fetchSummary, { immediate: true });
+watch([() => props.range, () => props.stats, assistantId], fetchSummary, {
+  immediate: true,
+});
 
 // Render through the shared markdown formatter (html disabled, so it is safe)
 // used everywhere else for Captain output, instead of a bespoke parser. It