Add node GPS enablement + sourcing. Closes #53.

frontend/src/components/settings/SettingsRadioSection.tsx

@@ -54,6 +54,9 @@ export function SettingsRadioSection({
   const [sf, setSf] = useState('');
   const [cr, setCr] = useState('');
   const [pathHashMode, setPathHashMode] = useState('0');
+  const [advertLocationSource, setAdvertLocationSource] = useState<
+    'off' | 'node_gps' | 'saved_coords'
+  >('saved_coords');
   const [gettingLocation, setGettingLocation] = useState(false);
   const [busy, setBusy] = useState(false);
   const [rebooting, setRebooting] = useState(false);
@@ -86,6 +89,7 @@ export function SettingsRadioSection({
     setSf(String(config.radio.sf));
     setCr(String(config.radio.cr));
     setPathHashMode(String(config.path_hash_mode));
+    setAdvertLocationSource(config.advert_location_source ?? 'saved_coords');
   }, [config]);
 
   useEffect(() => {
@@ -175,6 +179,9 @@ export function SettingsRadioSection({
       lat: parsedLat,
       lon: parsedLon,
       tx_power: parsedTxPower,
+      ...(advertLocationSource !== (config.advert_location_source ?? 'saved_coords')
+        ? { advert_location_source: advertLocationSource }
+        : {}),
       radio: {
         freq: parsedFreq,
         bw: parsedBw,
@@ -506,6 +513,28 @@ export function SettingsRadioSection({
             />
           </div>
         </div>
+        <div className="space-y-2">
+          <Label htmlFor="advert-location-source">Advert Location Source</Label>
+          <select
+            id="advert-location-source"
+            value={advertLocationSource}
+            onChange={(e) =>
+              setAdvertLocationSource(e.target.value as 'off' | 'node_gps' | 'saved_coords')
+            }
+            className="w-full h-10 px-3 rounded-md border border-input bg-background text-sm ring-offset-background focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2"
+          >
+            <option value="off">Off</option>
+            <option value="node_gps">Use Node GPS</option>
+            <option value="saved_coords">Use Saved Coordinates</option>
+          </select>
+          <p className="text-xs text-muted-foreground">
+            This only controls which location source the radio puts into adverts. If you choose Use
+            Node GPS, GPS still has to be enabled manually on the node itself for live coordinates
+            to take effect; RemoteTerm cannot turn it on through the interface library. RemoteTerm
+            still uses the saved coordinates above for local distance math and similar UI
+            calculations.
+          </p>
+        </div>
       </div>
 
       {config.path_hash_mode_supported && (