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/translation/service.ts

@@ -9,6 +9,7 @@
 import { createHash } from 'node:crypto';
 
 import { prisma } from '@/lib/db';
+import { toEnglishClock } from '@/lib/schedule/format';
 
 import { LoxiTranslationProvider, loxiConfigFromEnv } from './loxi';
 import type { TranslationOutcome, TranslationProvider } from './provider';
@@ -69,11 +70,18 @@ export async function translateToEnglish(
     return { ok: true, text: hit.translatedText, model: provider.model, cached: true };
   }
 
-  const outcome = await provider.translate({ text: source });
-  if (!outcome.ok) {
-    return outcome;
+  const raw = await provider.translate({ text: source });
+  if (!raw.ok) {
+    return raw;
   }
 
+  // The prompt tells the model to leave times untouched, because converting a
+  // clock is not a job for a language model. It is done here instead, so a
+  // translated notice and the labels this application writes itself never show
+  // two different conventions on the same panel. A hand-written translation is
+  // not touched: that wording was somebody's explicit choice.
+  const outcome = { ...raw, text: toEnglishClock(raw.text) };
+
   // Two concurrent saves of the same text would race here; the upsert makes
   // the second a no-op instead of a crash.
   await prisma.translationCache.upsert({