test(admin): expand admin/invites page coverage

Status color paths (exhausted/expired/revoked), new-invite form
toggle, loadError banner.

5 new tests covering ~10 branches.

Refs #496.

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

frontend/src/routes/admin/invites/page.svelte.test.ts

@@ -198,4 +198,59 @@ describe('admin/invites page', () => {
 
 		await expect.element(page.getByText('Kein Ablauf')).toBeVisible();
 	});
+
+	it('renders the exhausted status with the correct color class', async () => {
+		render(AdminInvitesPage, {
+			props: { data: baseData({ invites: [makeInvite({ status: 'exhausted' })] }) }
+		});
+
+		// gray color for exhausted
+		const pill = Array.from(document.querySelectorAll('.bg-gray-100'));
+		expect(pill.length).toBeGreaterThan(0);
+	});
+
+	it('renders the expired status with the correct color class', async () => {
+		render(AdminInvitesPage, {
+			props: { data: baseData({ invites: [makeInvite({ status: 'expired' })] }) }
+		});
+
+		// amber color for expired
+		const pill = Array.from(document.querySelectorAll('.bg-amber-50'));
+		expect(pill.length).toBeGreaterThan(0);
+	});
+
+	it('renders the revoked status with the correct color class', async () => {
+		render(AdminInvitesPage, {
+			props: { data: baseData({ invites: [makeInvite({ status: 'revoked' })] }) }
+		});
+
+		const pill = Array.from(document.querySelectorAll('.bg-red-50'));
+		// May have other red elements (like loadError) — at least one
+		expect(pill.length).toBeGreaterThan(0);
+	});
+
+	it('toggles the new-invite form when the button is clicked', async () => {
+		render(AdminInvitesPage, { props: { data: baseData(), form: undefined } });
+
+		const formBefore = document.querySelector('form[action="?/create"]');
+		expect(formBefore).toBeNull();
+
+		const newBtn = Array.from(document.querySelectorAll('button')).find((b) =>
+			/neue|invite|einladung/i.test(b.textContent ?? '')
+		) as HTMLButtonElement | undefined;
+		newBtn?.click();
+		await new Promise((r) => setTimeout(r, 30));
+
+		const formAfter = document.querySelector('form[action="?/create"]');
+		expect(formAfter).not.toBeNull();
+	});
+
+	it('shows the load error banner when data.loadError is set', async () => {
+		render(AdminInvitesPage, {
+			props: { data: baseData({ loadError: 'INTERNAL_ERROR' }), form: undefined }
+		});
+
+		const banner = document.querySelector('.bg-red-50');
+		expect(banner).not.toBeNull();
+	});
 });