UX: Adjust user-field labels (#32317)

app/assets/stylesheets/common/base/login-signup-page.scss

@@ -119,7 +119,7 @@ body.signup-page {
       width: 100%;
     }
 
-    input:focus {
+    input:not(.filter-input):focus {
       outline: none;
       border: 1px solid var(--tertiary);
       box-shadow: 0 0 0 2px rgba(var(--tertiary-rgb), 0.25);
@@ -160,6 +160,11 @@ body.signup-page {
       font-size: $font-down-1;
     }
 
+    .user-field.multiselect label.control-label,
+    .user-field.dropdown label.control-label {
+      z-index: z("dropdown") + 1;
+    }
+
     .user-field.text label.control-label {
       top: 13px;
     }

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

@@ -493,16 +493,6 @@ blockquote {
   padding: 12px;
 }
 
-aside.quote .title {
-  border-bottom-right-radius: 0;
-  border-bottom-left-radius: 0;
-}
-
-aside.quote .title + blockquote {
-  border-top-left-radius: 0;
-  border-top-right-radius: 0;
-}
-
 /* quotes with attribution */
 .quote {
   & > blockquote {