M54: harden operations and demo resilience

frontend/src/api/errorMessages.ts

@@ -24,6 +24,7 @@ export const KNOWN_CODES = new Set([
   "EVENT_NOT_FOUND",
   "ISSUE_NOT_FOUND",
   "ISSUE_NOT_OPEN",
+  "ISSUE_CHANGED",
   "BOOKING_NOT_ACTIVE",
   "INVALID_BOOKING_STATE",
   "NOT_RETRYABLE",
@@ -36,6 +37,9 @@ export const KNOWN_CODES = new Set([
   "INVALID_SURVIVOR",
   "INVALID_BOOKING_REFERENCE",
   "INVALID_EVENT_ID",
+  "INVALID_EVENT_CORRELATION",
+  "CALLBACK_EVENT_MISMATCH",
+  "CALLBACK_CORRELATION_MISMATCH",
   "INVALID_IDEMPOTENCY_KEY",
   "IDEMPOTENCY_KEY_REUSED",
   "CORRECTED_VALUE_REQUIRED",

frontend/src/api/types.ts

@@ -245,7 +245,7 @@ export interface ReturnPreviewResult {
 }
 
 export interface EntitySnapshot {
-  entity_type: "customer" | "vehicle" | "booking" | "inspection";
+  entity_type: "customer" | "vehicle" | "booking" | "inspection" | "maintenance";
   public_ref: string;
   [key: string]: unknown;
 }