fix: BB admin login no longer bounces to distribute

Problem: /admin/* pages redirect unauthed users to /login or /account,
both of which then hit middleware redirecting to distribute.relevant
mediaproperties.com. Distribute is on a different domain, so its session
cookie doesn't carry to broadcastbeat.com — sign-in there left admins
stranded on distribute's dashboard.

Fix:
  - Remove /login (and /register) from middleware REDIRECT_PATHS. wp-login,
    wp-admin, client-login still bounce to distribute.
  - /login is now a real BB sign-in form (was a redirect to /client-login).
  - Admin pages preserve return path via /login?next=<encoded path>.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/admin/accounting/clients/page.tsx

@@ -39,7 +39,7 @@ export default function ClientsPage() {
   const [errors, setErrors] = useState<Record<string, string>>({});
   const [successMsg, setSuccessMsg] = useState('');
 
-  useEffect(() => { if (!loading && !user) router.push('/login'); }, [user, loading, router]);
+  useEffect(() => { if (!loading && !user) router.push('/login?next=' + encodeURIComponent(window.location.pathname)); }, [user, loading, router]);
 
   const load = useCallback(async () => {
     setLoadingData(true);

src/app/admin/accounting/commissions/page.tsx

@@ -16,7 +16,7 @@ export default function CommissionsPage() {
   const [filterStaff, setFilterStaff] = useState('');
   const [staff, setStaff] = useState<any[]>([]);
 
-  useEffect(() => { if (!loading && !user) router.push('/login'); }, [user, loading, router]);
+  useEffect(() => { if (!loading && !user) router.push('/login?next=' + encodeURIComponent(window.location.pathname)); }, [user, loading, router]);
 
   const load = useCallback(async () => {
     setLoadingData(true);

src/app/admin/accounting/documents/page.tsx

@@ -17,7 +17,7 @@ export default function DocumentsPage() {
   const [saving, setSaving] = useState(false);
   const [form, setForm] = useState({ document_type: 'sales_agreement', title: '', year: String(new Date().getFullYear()), person: '', file_url: '', notes: '' });
 
-  useEffect(() => { if (!loading && !user) router.push('/login'); }, [user, loading, router]);
+  useEffect(() => { if (!loading && !user) router.push('/login?next=' + encodeURIComponent(window.location.pathname)); }, [user, loading, router]);
 
   const load = useCallback(async () => {
     setLoadingData(true);

src/app/admin/accounting/expenses/page.tsx

@@ -24,7 +24,7 @@ export default function ExpensesPage() {
   const [errors, setErrors] = useState<Record<string, string>>({});
   const [successMsg, setSuccessMsg] = useState('');
 
-  useEffect(() => { if (!loading && !user) router.push('/login'); }, [user, loading, router]);
+  useEffect(() => { if (!loading && !user) router.push('/login?next=' + encodeURIComponent(window.location.pathname)); }, [user, loading, router]);
 
   const load = useCallback(async () => {
     setLoadingData(true);

src/app/admin/accounting/invoices/page.tsx

@@ -26,7 +26,7 @@ function InvoicesContent() {
   const [payErrors, setPayErrors] = useState<Record<string, string>>({});
   const [successMsg, setSuccessMsg] = useState('');
 
-  useEffect(() => { if (!loading && !user) router.push('/login'); }, [user, loading, router]);
+  useEffect(() => { if (!loading && !user) router.push('/login?next=' + encodeURIComponent(window.location.pathname)); }, [user, loading, router]);
 
   const load = useCallback(async () => {
     setLoadingData(true);

src/app/admin/accounting/orders/page.tsx

@@ -32,7 +32,7 @@ function OrdersContent() {
     invoicing_schedule: 'single', next_invoice_date: '', staff_id: '', po_number: '', notes: '',
   });
 
-  useEffect(() => { if (!loading && !user) router.push('/login'); }, [user, loading, router]);
+  useEffect(() => { if (!loading && !user) router.push('/login?next=' + encodeURIComponent(window.location.pathname)); }, [user, loading, router]);
 
   const load = useCallback(async () => {
     setLoadingData(true);

src/app/admin/accounting/page.tsx

@@ -26,7 +26,7 @@ export default function AccountingDashboard() {
   const [loadingData, setLoadingData] = useState(true);
 
   useEffect(() => {
-    if (!loading && !user) router.push('/login');
+    if (!loading && !user) router.push('/login?next=' + encodeURIComponent(window.location.pathname));
   }, [user, loading, router]);
 
   useEffect(() => {

src/app/admin/accounting/reconciliation/page.tsx

@@ -14,7 +14,7 @@ export default function ReconciliationPage() {
   const [uploading, setUploading] = useState(false);
   const [summary, setSummary] = useState<{ matched: number; unmatched: number } | null>(null);
 
-  useEffect(() => { if (!loading && !user) router.push('/login'); }, [user, loading, router]);
+  useEffect(() => { if (!loading && !user) router.push('/login?next=' + encodeURIComponent(window.location.pathname)); }, [user, loading, router]);
 
   const load = useCallback(async () => {
     setLoadingData(true);

src/app/admin/accounting/reports/page.tsx

@@ -16,7 +16,7 @@ export default function ReportsPage() {
   const [startDate, setStartDate] = useState(`${new Date().getFullYear()}-01-01`);
   const [endDate, setEndDate] = useState(new Date().toISOString().split('T')[0]);
 
-  useEffect(() => { if (!loading && !user) router.push('/login'); }, [user, loading, router]);
+  useEffect(() => { if (!loading && !user) router.push('/login?next=' + encodeURIComponent(window.location.pathname)); }, [user, loading, router]);
 
   async function loadReport() {
     setLoadingData(true);

src/app/admin/accounting/staff/page.tsx

@@ -22,7 +22,7 @@ export default function StaffPage() {
   const [errors, setErrors] = useState<Record<string, string>>({});
   const [successMsg, setSuccessMsg] = useState('');
 
-  useEffect(() => { if (!loading && !user) router.push('/login'); }, [user, loading, router]);
+  useEffect(() => { if (!loading && !user) router.push('/login?next=' + encodeURIComponent(window.location.pathname)); }, [user, loading, router]);
 
   const load = useCallback(async () => {
     setLoadingData(true);