fix: odometer sync is Pi→Server only — portal displays read-only value from DB

static/js/portal-device-settings.js

@@ -28,9 +28,12 @@ const fields = {
     car_model: document.getElementById('car_model'),
     device_name: document.getElementById('device_name'),
     avatar_path: document.getElementById('avatar_path'),
-    odometer_baseline: document.getElementById('odometer_baseline'),
 };
 
+// Read-only display field — populated from server config, never sent on save.
+// Odometer is Pi→Server only: the Pi pushes its baseline, the portal just shows it.
+const odometerField = document.getElementById('odometer_baseline');
+
 let devices = [];
 let selectedDeviceId = null;
 let initialState = null;
@@ -57,7 +60,6 @@ function currentState() {
         car_model: fields.car_model.value.trim(),
         device_name: fields.device_name.value.trim(),
         avatar_path: fields.avatar_path.value.trim(),
-        odometer_baseline: Number(fields.odometer_baseline.value) || 0,
     };
 }
 
@@ -117,7 +119,7 @@ function populateDevice(device, config) {
     fields.car_model.value = config.car_model || '';
     fields.device_name.value = config.device_name || '';
     fields.avatar_path.value = config.avatar_path || '';
-    fields.odometer_baseline.value = (config.odometer_baseline || 0).toFixed(1);
+    odometerField.value = (config.odometer_baseline || 0).toFixed(1);
     initialState = currentState();
     credentialFields.deviceName.value = device.name;
     renderDeviceList();