Fix jwt-token

client/src/pages/Devices.jsx

@@ -641,13 +641,17 @@ const DeviceModal = ({ device, onClose, onSave }) => {
                       Device ID *
                     </label>
                     <input
-                      type="number"
+                      type="text"
                       name="id"
                       required
+                      placeholder="e.g. device-001 or sensor-alpha-123"
                       className="w-full border border-gray-300 rounded-md px-3 py-2 focus:ring-primary-500 focus:border-primary-500"
                       value={formData.id}
                       onChange={handleChange}
                     />
+                    <p className="text-xs text-gray-500 mt-1">
+                      Enter a unique identifier for the device (letters, numbers, dashes allowed)
+                    </p>
                   </div>
                 )}