feat: clear a meal-plan day or the whole week in one action

New bulk-delete route for the owner's own weekStart-scoped plan
(mirrors recipes/bulk's DELETE), plus ?ids= support added to the
existing shared-plan DELETE route (kept ?entryId= working
unchanged). UI: hover-reveal trash icon per day header, "Clear week"
button in the toolbar, one shared confirm dialog for both.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/messages/fr.json

@@ -817,7 +817,13 @@
     "removeEntry": "Retirer le repas",
     "markCooked": "Marquer comme cuisiné",
     "markCookedSuccess": "Marqué comme cuisiné",
-    "markCookedFailed": "Échec du marquage comme cuisiné"
+    "markCookedFailed": "Échec du marquage comme cuisiné",
+    "clearDay": "Vider la journée",
+    "clearWeek": "Vider la semaine",
+    "clearDayConfirmTitle": "Vider {day} ?",
+    "clearWeekConfirmTitle": "Vider toute la semaine ?",
+    "clearConfirmDescription": "Cela retire tous les repas planifiés affichés — les recettes elles-mêmes ne sont pas supprimées.",
+    "clearedSuccess": "{count, plural, one {1 repas retiré} other {{count} repas retirés}}"
   },
   "pantry": {
     "title": "Garde-manger",