fix: GIF loading spinner rendered as a padded square

The .emoji-picker span emoji-cell rule clobbered the spinner's circle
(30px padded rounded-square). Re-assert its shape and bump it to 48px.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: JSKitty

src/styles.css

@@ -5092,6 +5092,16 @@ img.emoji-img-loading {
   display: inline-block;
 }
 
+/* The GIF spinner is a <span> inside .emoji-picker, so the emoji-cell rule
+   above would force it into a 30px padded rounded-square. Re-assert its circle. */
+.emoji-picker .loading-spinner {
+  width: 48px;
+  height: 48px;
+  padding: 0;
+  border-width: 3px;
+  border-radius: 50%;
+}
+
 /* Inputs need normal text selection so typing/editing works. */
 .emoji-picker input,
 .emoji-picker textarea {