a11y(insights): announce loaded assessment via polite live region

Mirror the aria-live=polite the loading skeleton already carries onto
the success card so screen readers announce the assessment when it
swaps into the same slot the skeleton occupied. Closes the load to
loaded transition signal flagged in W10 P2-2.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/insights/insight-status-card.tsx

@@ -105,7 +105,15 @@ export function InsightStatusCard({
   }
 
   return (
-    <Card className="animate-insight-in border-l-dracula-purple border-l-2">
+    // v1.4.38 W-D P2-2 — `aria-live="polite"` so screen readers
+    // announce the assessment when it swaps into the same slot the
+    // structured skeleton occupied. The skeleton card already carries
+    // `aria-busy="true" aria-live="polite"`; mirroring the live region
+    // on the success card closes the load→loaded transition signal.
+    <Card
+      aria-live="polite"
+      className="animate-insight-in border-l-dracula-purple border-l-2"
+    >
       <CardHeader className="pb-2">
         <div className="flex items-center justify-between">
           <div className="flex items-center gap-2">