feat: add contract extension request functionality

- Implemented  method in  to allow customers to request an extension for expired contracts.
- Added  component in  for users to initiate extension requests.
- Updated  to include logic for handling extension requests for expired contracts.
- Enhanced  to display extension request options and status.
- Created migration to add  and  columns to the contracts table.
- Added unit tests for contract extension request and handling in .
- Defined DTOs for request and extension in .
- Updated types in  to include new fields related to contract extensions.

packages/types/src/freight/contracts.ts

@@ -844,6 +844,22 @@ export interface IContract extends BaseEntity {
    * SUSPENDED). Shown to both staff and customer.
    */
   latestSuspensionNote?: string | null;
+  /**
+   * Status the contract held when it lapsed to EXPIRED; restored when staff
+   * extend it. Null on rows that expired before this was tracked.
+   */
+  statusBeforeExpiry?: ContractStatus | null;
+  /**
+   * When the customer asked for this EXPIRED contract's validity to be
+   * extended. Null when never asked, and cleared again once staff extend it.
+   * Staff can only extend while it is set.
+   */
+  extensionRequestedAt?: string | null;
+  /**
+   * Body of the latest EXTENSION_REQUESTED review note (detail response only,
+   * while the request is pending). Tells staff why the customer wants more time.
+   */
+  latestExtensionRequestNote?: string | null;
   /**
    * Bookings on this contract that are not in a terminal state (detail response
    * only). The portal's cancel action is blocked while this is > 0.
@@ -1157,3 +1173,17 @@ export interface RenewContractDto {
   /** Reference of the prior contract being renewed. */
   previousContractReference?: string;
 }
+
+/** Customer asks EDR to extend the validity of their EXPIRED contract. */
+export interface RequestContractExtensionDto {
+  /** Why the customer needs more time (optional, shown to staff). */
+  note?: string;
+}
+
+/** Staff extend an EXPIRED contract the customer asked to extend. */
+export interface ExtendContractDto {
+  /** Days to add — from today once lapsed, else from the current end date. */
+  days: number;
+  /** Optional note recorded with the extension and shown to the customer. */
+  note?: string;
+}