fix(detail): keep the zone card's hierarchy matching the When card

The When card reads date-large, time-small-beneath. The zone card led
with the original time at titleMedium and dropped the zone label to
bodyMedium, inverting that — which made the foreign time the loudest
thing on the screen and pulled attention off the local time the reader
actually acts on.

Put the label back on top and the original time small beneath it, so both
cards read the same way and the original stays available without
competing. The label already names the zone, so the range drops its "in
New York" tail (and the string with it).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/src/main/res/values/strings.xml

@@ -111,9 +111,6 @@
          the same event expressed where the user actually is. %1$s is a time
          range, e.g. "2:00 PM – 3:00 PM". -->
     <string name="event_edit_timezone_local_time">%1$s your time</string>
-    <!-- The event's own zone times on the detail screen. %1$s is a time range,
-         %2$s the zone's city, e.g. "8:00 AM – 9:00 AM in New York". -->
-    <string name="event_detail_timezone_original">%1$s in %2$s</string>
 
     <!-- Event form — per-event color -->
     <string name="event_edit_color">Color</string>