feat(ui): add success indicator dot to autofix request hint

Enhance the autofix request card by adding a green static dot next to
the success hint message. This visual indicator improves clarity by
making the success state more distinguishable for users.

Author: rohitpaulk

app/components/course-page/test-results-bar/autofix-request-card.hbs

@@ -7,7 +7,14 @@
           <span class="text-lg font-semibold text-white">Generating custom hint...</span>
         </div>
       {{else if (eq status "success")}}
-        <span class="text-lg font-semibold text-white">Hint: {{@autofixRequest.summary}}</span>
+        <div class="flex items-start gap-2">
+          <StaticDot @color="green" class="shrink-0 mt-2" />
+
+          <span class="text-lg font-semibold text-white">
+            Hint:
+            {{@autofixRequest.summary}}
+          </span>
+        </div>
       {{/if}}
     {{/animated-value}}