[Glitch] Add error boundary around routes in web UI

Port a43a823768 to glitch-soc

Co-authored-by: Yamagishi Kazutoshi <ykzts@desire.sh>
Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/styles/components/index.scss

@@ -189,6 +189,15 @@
     color: $highlight-text-color;
   }
 
+  &.copyable {
+    transition: background 300ms linear;
+  }
+
+  &.copied {
+    background: $valid-value-color;
+    transition: none;
+  }
+
   &::-moz-focus-inner {
     border: 0;
   }