fix(air-quality): address code review findings

- Redact AQICN API token from debug logs (security)
- Remove orphan i18n key panel.station
- Clear stationName on refresh to avoid stale data
- Disable AQI scale dropdown when AQICN is selected (US only)
- Update stale comment in saveSettings()

Author: adriamartin91

air-quality/Main.qml

@@ -274,6 +274,7 @@ Item {
     }
 
     root.loading = true
+    root.stationName = ""
 
     if (root.dataSource === "aqicn") {
       if (!root.aqicnToken) {
@@ -283,7 +284,7 @@ Item {
         return
       }
       var aqicnUrl = "https://api.waqi.info/feed/geo:" + lat + ";" + lon + "/?token=" + root.aqicnToken
-      Logger.d("Air Quality", "Fetching AQICN: " + aqicnUrl)
+      Logger.d("Air Quality", "Fetching AQICN data for geo:" + lat + ";" + lon)
       aqicnFetchProcess.command = ["curl", "-s", aqicnUrl]
       aqicnFetchProcess.running = true
     } else {

air-quality/Settings.qml

@@ -54,6 +54,7 @@ ColumnLayout {
       currentKey: root.editDataSource
       onSelected: key => {
         root.editDataSource = key
+        if (key === "aqicn") root.editAqiScale = "us"
       }
     }
   }
@@ -94,6 +95,7 @@ ColumnLayout {
     NComboBox {
       Layout.preferredWidth: 180 * Style.uiScaleRatio
       Layout.preferredHeight: Style.baseWidgetSize
+      enabled: root.editDataSource !== "aqicn"
       model: [
         { key: "us", name: pluginApi?.tr("settings.aqiScaleUs") },
         { key: "eu", name: pluginApi?.tr("settings.aqiScaleEu") }
@@ -197,7 +199,7 @@ ColumnLayout {
 
     pluginApi.saveSettings()
 
-    // Only refresh if location or scale changed
+    // Only refresh if location, scale, or data source changed
     if (locationChanged || scaleChanged || dataSourceChanged) {
       root.pluginApi.mainInstance?.refresh()
     }

air-quality/i18n/en.json

@@ -54,8 +54,7 @@
     "refresh": "Refresh",
     "settings": "Settings",
     "noData": "No data available",
-    "loading": "Loading...",
-    "station": "Station"
+    "loading": "Loading..."
   },
   "settings": {
     "aqiScale": "AQI Scale",