Phase 1d: react-hook-form + zod on Login and NewTicket

- Both forms use useForm with zodResolver against shared schemas
  (loginSchema, createTicketSchema)
- Field-level errors rendered inline under inputs
- isSubmitting drives button disabled state
- NewTicket: severity registered with valueAsNumber; CTISelect wrapped in
  nested Controllers (one per categoryId/typeId/itemId) since it controls
  three form fields as a single compound input
- Admin forms stay on useState for now — they get redesigned with shadcn
  dialogs in Phase 3, RHF migration lands with that

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

client/src/pages/Login.tsx

@@ -1,29 +1,37 @@
 import { useState } from 'react';
 import { useNavigate } from 'react-router-dom';
+import { useForm } from 'react-hook-form';
+import { zodResolver } from '@hookform/resolvers/zod';
+import { loginSchema, type LoginInput } from '../../../shared/schemas/auth';
 import { useAuth } from '../contexts/AuthContext';
 
 export default function Login() {
   const { login } = useAuth();
   const navigate = useNavigate();
-  const [username, setUsername] = useState('');
-  const [password, setPassword] = useState('');
   const [error, setError] = useState('');
-  const [loading, setLoading] = useState(false);
 
-  const handleSubmit = async (e: React.FormEvent) => {
-    e.preventDefault();
+  const {
+    register,
+    handleSubmit,
+    formState: { errors, isSubmitting },
+  } = useForm<LoginInput>({
+    resolver: zodResolver(loginSchema),
+    defaultValues: { username: '', password: '' },
+  });
+
+  const onSubmit = async (data: LoginInput) => {
     setError('');
-    setLoading(true);
     try {
-      await login(username, password);
+      await login(data.username, data.password);
       navigate('/');
     } catch {
       setError('Invalid username or password');
-    } finally {
-      setLoading(false);
     }
   };
 
+  const inputClass =
+    'w-full bg-gray-800 border border-gray-700 text-gray-100 placeholder-gray-500 rounded-lg px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent';
+
   return (
     <div className="min-h-screen bg-gray-950 flex items-center justify-center px-4">
       <div className="w-full max-w-sm">
@@ -33,8 +41,9 @@ export default function Login() {
         </div>
 
         <form
-          onSubmit={handleSubmit}
+          onSubmit={handleSubmit(onSubmit)}
           className="bg-gray-900 border border-gray-800 rounded-xl shadow-2xl p-8 space-y-4"
+          noValidate
         >
           {error && (
             <div className="bg-red-500/10 border border-red-500/30 text-red-400 text-sm px-4 py-3 rounded-lg">
@@ -44,33 +53,26 @@ export default function Login() {
 
           <div>
             <label className="block text-sm font-medium text-gray-300 mb-1">Username</label>
-            <input
-              type="text"
-              value={username}
-              onChange={(e) => setUsername(e.target.value)}
-              required
-              autoFocus
-              className="w-full bg-gray-800 border border-gray-700 text-gray-100 placeholder-gray-500 rounded-lg px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent"
-            />
+            <input type="text" autoFocus className={inputClass} {...register('username')} />
+            {errors.username && (
+              <p className="mt-1 text-xs text-red-400">{errors.username.message}</p>
+            )}
           </div>
 
           <div>
             <label className="block text-sm font-medium text-gray-300 mb-1">Password</label>
-            <input
-              type="password"
-              value={password}
-              onChange={(e) => setPassword(e.target.value)}
-              required
-              className="w-full bg-gray-800 border border-gray-700 text-gray-100 placeholder-gray-500 rounded-lg px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent"
-            />
+            <input type="password" className={inputClass} {...register('password')} />
+            {errors.password && (
+              <p className="mt-1 text-xs text-red-400">{errors.password.message}</p>
+            )}
           </div>
 
           <button
             type="submit"
-            disabled={loading}
+            disabled={isSubmitting}
             className="w-full bg-blue-600 text-white py-2 rounded-lg text-sm font-medium hover:bg-blue-700 disabled:opacity-50 transition-colors"
           >
-            {loading ? 'Signing in...' : 'Sign in'}
+            {isSubmitting ? 'Signing in...' : 'Sign in'}
           </button>
         </form>
       </div>