M39: harden application and acceptance gates

frontend/src/i18n/brusselsDateTime.ts

@@ -44,3 +44,15 @@ export function brusselsLocalToIso(value: string): string {
   }
   return new Date(candidate).toISOString();
 }
+
+/** Start of the given Brussels calendar day (YYYY-MM-DD) as a UTC ISO instant. */
+export function brusselsDayStartIso(day: string): string {
+  return brusselsLocalToIso(`${day}T00:00`);
+}
+
+/** Start of the day *after* the given Brussels calendar day, i.e. an exclusive upper bound. */
+export function brusselsNextDayStartIso(day: string): string {
+  const [year, month, date] = day.split("-").map(Number);
+  const next = new Date(Date.UTC(year, month - 1, date + 1));
+  return brusselsLocalToIso(`${next.toISOString().slice(0, 10)}T00:00`);
+}

frontend/src/i18n/locales/en-GB/errors.json

@@ -16,6 +16,11 @@
       "title": "Customer not found",
       "explanation": "This customer record could not be found."
     },
+    "CUSTOMER_ALREADY_MERGED": {
+      "title": "Customer already merged",
+      "explanation": "One of these customer records has already been merged into another record.",
+      "nextStep": "Reload the issue; it may already be resolved."
+    },
     "ENTITY_NOT_FOUND": {
       "title": "Record not found",
       "explanation": "The underlying record for this action could not be found."

frontend/src/i18n/locales/fr-BE/errors.json

@@ -16,6 +16,11 @@
       "title": "Client introuvable",
       "explanation": "Cette fiche client est introuvable."
     },
+    "CUSTOMER_ALREADY_MERGED": {
+      "title": "Client déjà fusionné",
+      "explanation": "L'une de ces fiches client a déjà été fusionnée avec une autre fiche.",
+      "nextStep": "Rechargez le problème ; il est peut-être déjà résolu."
+    },
     "ENTITY_NOT_FOUND": {
       "title": "Fiche introuvable",
       "explanation": "La fiche sous-jacente à cette action est introuvable."

frontend/src/i18n/locales/nl-BE/errors.json

@@ -16,6 +16,11 @@
       "title": "Klant niet gevonden",
       "explanation": "Dit klantrecord kon niet gevonden worden."
     },
+    "CUSTOMER_ALREADY_MERGED": {
+      "title": "Klant al samengevoegd",
+      "explanation": "Eén van deze klantrecords is al samengevoegd met een ander record.",
+      "nextStep": "Herlaad het probleem; mogelijk is het al opgelost."
+    },
     "ENTITY_NOT_FOUND": {
       "title": "Record niet gevonden",
       "explanation": "Het onderliggende record voor deze actie kon niet gevonden worden."