feat(gifts): add redeem action and improve redeem UI state

Add a redeem member action to MembershipGiftModel that posts to the
redeem endpoint, enabling gift redemption via the API.

Update the gifts redeem controller to disable the redeem button while
a redemption is in progress to prevent duplicate submissions.

Implement actual redeem logic by calling the model's redeem action and
redirecting to the catalog on success.

Improve error handling by rethrowing caught errors and resetting the
redeeming state accordingly.

Author: rohitpaulk

app/controllers/gifts/redeem.ts

@@ -24,7 +24,7 @@ export default class GiftsRedeemController extends Controller {
 
   get redeemButtonIsDisabled() {
     // Button is disabled if user already has membership benefits
-    return this.currentUserCanAccessMembershipBenefits;
+    return this.currentUserCanAccessMembershipBenefits || this.isRedeemingGift;
   }
 
   @action
@@ -42,13 +42,12 @@ export default class GiftsRedeemController extends Controller {
     this.isRedeemingGift = true;
 
     try {
-      // TODO: Implement actual gift redeeming logic
-      // This would typically involve calling an API endpoint to redeem the gift
-      // For now, we'll just redirect to the catalog page as a placeholder
+      await this.model.redeem({});
       this.router.transitionTo('catalog');
-    } catch {
+    } catch (error) {
       // TODO: Handle error appropriately
       this.isRedeemingGift = false;
+      throw error;
     }
   }
 }

app/models/membership-gift.ts

@@ -1,4 +1,5 @@
 import Model, { attr, belongsTo } from '@ember-data/model';
+import { memberAction } from 'ember-api-actions';
 import type UserModel from 'codecrafters-frontend/models/user';
 
 export default class MembershipGiftModel extends Model {
@@ -10,4 +11,11 @@ export default class MembershipGiftModel extends Model {
   @attr('string') declare giftMessage: string;
   @attr('number') declare validityInDays: number;
   @attr('string') declare secretToken: string;
+
+  declare redeem: (this: MembershipGiftModel, payload: unknown) => Promise<void>;
 }
+
+MembershipGiftModel.prototype.redeem = memberAction({
+  path: 'redeem',
+  type: 'post',
+});