UX: fix topic map link expansion hover (#25822)

app/assets/javascripts/discourse/app/widgets/topic-map.js

@@ -34,7 +34,7 @@ createWidget("topic-map-show-links", {
         title: "topic_map.links_shown",
         icon: "chevron-down",
         action: "showLinks",
-        className: "btn",
+        className: "btn btn-flat",
       })
     );
   },

app/assets/stylesheets/common/base/topic-post.scss

@@ -759,6 +759,18 @@ aside.quote {
     }
   }
 
+  .link-summary .btn {
+    width: 100%;
+    .d-icon {
+      color: var(--primary-high);
+    }
+    .discourse-no-touch & {
+      &:hover {
+        background: var(--primary-low);
+      }
+    }
+  }
+
   .controls {
     display: flex;
     align-items: center;

app/assets/stylesheets/desktop/topic-post.scss

@@ -316,15 +316,6 @@ pre.codeblock-buttons:hover {
       }
     }
   }
-  .link-summary .btn {
-    color: var(--primary-med-or-secondary-high);
-    background: var(--blend-primary-secondary-5);
-    width: 100%;
-    &:hover {
-      color: var(--primary);
-      background: var(--primary-low);
-    }
-  }
 
   .toggle-summary .summarization-buttons .top-replies {
     margin-left: 10px;

app/assets/stylesheets/mobile/topic-post.scss

@@ -194,11 +194,6 @@ a.reply-to-tab {
       }
     }
   }
-  .link-summary .btn {
-    color: var(--primary-med-or-secondary-high);
-    background: var(--blend-primary-secondary-5);
-    width: 100%;
-  }
 
   .toggle-summary {
     .summarization-buttons {