Address code review feedback: remove duplicate cursor style and add aria-label

Co-authored-by: Sunwuyuan <88357633+Sunwuyuan@users.noreply.github.com>

Author: Copilot

src/components/settings/AboutCard.vue

@@ -39,6 +39,7 @@
               <div class="mt-4">
                 <v-btn
                   append-icon="mdi-heart"
+                  aria-label="Support Classworks on Aifadian"
                   class="text-none"
                   color="pink"
                   rounded="xl"
@@ -469,10 +470,6 @@ export default {
   transform: translateY(-2px);
 }
 
-.clickable {
-  cursor: pointer;
-}
-
 .card-content {
   display: flex;
   align-items: center;