feat: Add initial identifier field to user management and update related functions

src/app/admin/users/[id]/edit/page.js

@@ -18,6 +18,7 @@ export default function EditUserPage() {
 		username: "",
 		role: "user",
 		is_active: true,
+		initial: "",
 		password: ""
 	});
 	const [loading, setLoading] = useState(true);
@@ -65,6 +66,7 @@ export default function EditUserPage() {
 				username: userData.username,
 				role: userData.role,
 				is_active: userData.is_active,
+				initial: userData.initial || "",
 				password: "" // Never populate password field
 			});
 		} catch (err) {
@@ -86,7 +88,8 @@ export default function EditUserPage() {
 				name: formData.name,
 				username: formData.username,
 				role: formData.role,
-				is_active: formData.is_active
+				is_active: formData.is_active,
+				initial: formData.initial.trim() || null
 			};
 
 			// Only include password if it's provided
@@ -253,6 +256,23 @@ export default function EditUserPage() {
 							</div>
 						</div>
 
+						<div>
+							<label className="block text-sm font-medium text-gray-700 mb-2">
+								Initial
+							</label>
+							<Input
+								type="text"
+								value={formData.initial}
+								onChange={(e) => setFormData({ ...formData, initial: e.target.value })}
+								placeholder="1-2 letter identifier"
+								maxLength={2}
+								className="w-full md:w-1/2"
+							/>
+							<p className="text-xs text-gray-500 mt-1">
+								Optional 1-2 letter identifier for the user
+							</p>
+						</div>
+
 						<div className="flex items-center">
 							<input
 								type="checkbox"