fix: LoginPage accessibility (labels, alert), open-redirect guard

src/admin/auth/LoginPage.jsx

@@ -11,7 +11,8 @@ const LoginPage = () => {
   const { login } = useAuth();
   const navigate = useNavigate();
   const location = useLocation();
-  const from = location.state?.from?.pathname || '/admin/kanban';
+  const rawFrom = location.state?.from?.pathname || '/admin/kanban';
+  const from = rawFrom.startsWith('/admin') ? rawFrom : '/admin/kanban';
 
   const handleSubmit = async (e) => {
     e.preventDefault();
@@ -22,6 +23,7 @@ const LoginPage = () => {
       setError('Неверный email или пароль');
       setSubmitting(false);
     } else {
+      setSubmitting(false);
       navigate(from, { replace: true });
     }
   };
@@ -64,8 +66,9 @@ const LoginPage = () => {
 
         <form onSubmit={handleSubmit} style={{ display: 'flex', flexDirection: 'column', gap: '20px' }}>
           <div>
-            <label style={labelStyle}>Email</label>
+            <label htmlFor="login-email" style={labelStyle}>Email</label>
             <input
+              id="login-email"
               type="email"
               value={email}
               onChange={(e) => setEmail(e.target.value)}
@@ -77,8 +80,9 @@ const LoginPage = () => {
           </div>
 
           <div>
-            <label style={labelStyle}>Пароль</label>
+            <label htmlFor="login-password" style={labelStyle}>Пароль</label>
             <input
+              id="login-password"
               type="password"
               value={password}
               onChange={(e) => setPassword(e.target.value)}
@@ -90,7 +94,7 @@ const LoginPage = () => {
           </div>
 
           {error && (
-            <p style={{ color: '#ef4444', fontSize: '0.9rem', margin: 0 }}>{error}</p>
+            <p role="alert" style={{ color: '#ef4444', fontSize: '0.9rem', margin: 0 }}>{error}</p>
           )}
 
           <button