components: Honour 'prefers reduced motion' setting in many components

This helps accessibility for motion-sensitive people such as myself, and
can improve battery life in "battery saving" mode on most devices

src/components/status_body/status_body.scss

@@ -17,6 +17,9 @@
 
   .emoji:hover {
     transform: scale(1.4);
+    @media (prefers-reduced-motion: reduce) {
+      transition: unset;
+    }
     transition: 0.05s;
   }