fix(members/invites): unwrap ApiResponse before returning to client

POST /members/invites was returning the full ApiResponseInviteResponse
wrapper. The client set activeInvite directly from the response body,
so shareUrl/inviteCode/expiresAt were missing (nested under .data).
Fixed to return data?.data — the inner InviteResponse — matching the
shape that InvitePanel and page.server.ts already expect.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/(app)/members/invites/+server.ts

@@ -5,5 +5,5 @@ import { apiClient } from '$lib/server/api';
 export const POST: RequestHandler = async ({ fetch }) => {
 	const api = apiClient(fetch);
 	const { data, response } = await api.POST('/v1/households/mine/invites');
-	return json(data, { status: response?.status ?? 201 });
+	return json(data?.data, { status: response?.status ?? 201 });
 };

frontend/src/routes/(app)/members/invites/server.test.ts

@@ -0,0 +1,33 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+
+vi.mock('$env/dynamic/private', () => ({ env: { BACKEND_URL: 'http://localhost:8080' } }));
+
+const mockPost = vi.fn();
+vi.mock('$lib/server/api', () => ({
+	apiClient: () => ({ POST: mockPost })
+}));
+
+describe('invites server route', () => {
+	let POST: any;
+
+	beforeEach(async () => {
+		mockPost.mockReset();
+		vi.resetModules();
+		const mod = await import('./+server');
+		POST = mod.POST;
+	});
+
+	it('POST returns unwrapped InviteResponse', async () => {
+		const invite = { inviteCode: 'ABC123', shareUrl: 'https://x.com/join/ABC123', expiresAt: '2026-12-01T00:00:00Z' };
+		mockPost.mockResolvedValue({
+			data: { status: 'success', data: invite },
+			response: { status: 200 }
+		});
+		const event = { fetch: vi.fn() } as any;
+		const res = await POST(event);
+		const body = await res.json();
+		expect(body.inviteCode).toBe('ABC123');
+		expect(body.shareUrl).toBe('https://x.com/join/ABC123');
+		expect(body.expiresAt).toBe('2026-12-01T00:00:00Z');
+	});
+});