refactor: consistent time formatting for 12h mode

apps/client/src/features/viewers/common/superscript-time/SuperscriptPeriod.tsx

@@ -0,0 +1,23 @@
+import './SuperscriptTime.scss';
+
+interface SuperscriptPeriodProps {
+  time: string;
+  className?: string;
+}
+
+/**
+ * Receives a time string and formats periods (am/pm) as superscript
+ * @example 12:00 AM -> AM becomes a superscript
+ * @example 12:00:10 -> no formatting changes applied
+ */
+export default function SuperscriptPeriod({ time, className }: SuperscriptPeriodProps) {
+  // we assume anything after space is a period tag
+  const [timeString, period] = time.split(' ');
+
+  return (
+    <div className={className}>
+      {timeString}
+      {period && <sup className='period'>{period}</sup>}
+    </div>
+  );
+}