fix: show one clock convention in English on the panel

The labels this application writes itself already read "6:30 pm", while
a translated notice kept whatever the French said, so the screen could
show "Closes at 6:30 pm" above "Delayed opening at 14:00". Two
conventions side by side on one panel.

The conversion is done in code, not by the prompt. The model is still
told to leave times alone — reading a clock and rewriting it is
deterministic work, and asking a language model to do it introduces a
failure mode for no benefit. Only HH:mm is touched, never a time that
already carries am or pm, so the pass is idempotent and years, dates
written 20/07 and percentages are left alone.

Hand-written translations are not rewritten: that wording was somebody's
explicit choice.

Verified against the live service: "Ouvert 10:00 – 13:00 puis 14:00 –
18:30" now comes back as "Open 10:00 am – 1:00 pm then 2:00 pm –
6:30 pm".

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012cSY9pVhZmJUKNN7wf1Myd

lib/schedule/format.ts

@@ -97,6 +97,26 @@ export function formatTimeEn(time: string): string {
   return `${hour12}:${minute.toString().padStart(2, '0')} ${suffix}`;
 }
 
+/**
+ * Rewrites 24-hour times in English text to the 12-hour clock.
+ *
+ * The labels this application generates itself already read "6:30 pm", while a
+ * translated message keeps whatever the source said, because the prompt tells
+ * the model to leave times alone — which it should, since converting a clock
+ * is not a job for a language model. Doing it here instead keeps both
+ * conventions from appearing side by side on the same panel.
+ *
+ * Only `HH:mm` is touched, and never a time that already carries am/pm, so
+ * years and dates written 20/07 are left alone.
+ */
+export function toEnglishClock(text: string): string {
+  return text.replace(
+    /\b([01]?\d|2[0-3]):([0-5]\d)\b(?!\s*(?:am|pm|AM|PM))/g,
+    (match, hours: string, minutes: string) =>
+      formatTimeEn(`${hours.padStart(2, '0')}:${minutes}`) ?? match,
+  );
+}
+
 export function formatNextChangeFr(change: NextChange | null, today: CivilDate): string {
   if (!change) {
     return '';