Refresh billing state after ending trial period (#23534)

Fixes #23530

After adding a credit card in the billing prompt, the credits section
and subscription details stayed stale until a full page refresh.

The `endSubscriptionTrialPeriod` mutation only returned `status` and
`hasPaymentMethod`, and the frontend hook only patched the subscription
status into the workspace state. The credits query was never refetched,
so granted credits kept showing trial values, and `currentPeriodEnd`
(renewal date) and `billingCustomer.hasPaymentMethod` stayed outdated.
The backend already syncs everything to the database synchronously
before the mutation returns, so fresh data was available, just never
fetched.

Changes:
- `BillingEndTrialPeriodDTO` now includes nullable
`currentBillingSubscription` and `billingSubscriptions`, returned by the
resolver on success, mirroring the other billing update mutations
(`switchSubscriptionInterval`, etc.)
- `useEndSubscriptionTrialPeriod` applies the full billing update via
`useApplyCurrentWorkspaceBillingUpdate` (falling back to the previous
status-only patch), marks the billing customer as having a payment
method, and refetches `GetResourceCreditUsage` so the credits section
updates for any active observer

This covers all entry points that end the trial: the billing page card
modal, the trial banner, the AI chat banner, and the return from the
Stripe portal.

---
_Generated by [Claude
Code](https://claude.ai/code/session_01W1J7cW2MhaqXGfdjvHeFoX)_

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packages/twenty-server/src/engine/core-modules/billing/billing.resolver.ts

@@ -340,6 +340,14 @@ export class BillingResolver {
     return {
       hasPaymentMethod: result.hasPaymentMethod,
       status: result.status,
+      currentBillingSubscription:
+        await this.billingSubscriptionService.getCurrentBillingSubscriptionOrThrow(
+          { workspaceId: workspace.id },
+        ),
+      billingSubscriptions:
+        await this.billingSubscriptionService.getBillingSubscriptions(
+          workspace.id,
+        ),
     };
   }
 

packages/twenty-server/src/engine/core-modules/billing/dtos/billing-end-trial-period.dto.ts

@@ -2,6 +2,7 @@
 
 import { Field, ObjectType } from '@nestjs/graphql';
 
+import { BillingSubscriptionEntity } from 'src/engine/core-modules/billing/entities/billing-subscription.entity';
 import { SubscriptionStatus } from 'src/engine/core-modules/billing/enums/billing-subscription-status.enum';
 
 @ObjectType('BillingEndTrialPeriod')
@@ -23,4 +24,16 @@ export class BillingEndTrialPeriodDTO {
     nullable: true,
   })
   billingPortalUrl?: string;
+
+  @Field(() => BillingSubscriptionEntity, {
+    description: 'Updated current billing subscription',
+    nullable: true,
+  })
+  currentBillingSubscription?: BillingSubscriptionEntity;
+
+  @Field(() => [BillingSubscriptionEntity], {
+    description: 'All billing subscriptions',
+    nullable: true,
+  })
+  billingSubscriptions?: BillingSubscriptionEntity[];
 }