Add Ambient station primary source toggle; swap location name to station

When configured, a new "Use as primary source" toggle appears in Settings
under Ambient Weather Station (defaults on). When on, the location header
shows the station name and "Ambient Weather Station" subtitle instead of the
city; the hero badge is hidden as redundant. Toggling off restores the city
name immediately and re-shows the hero badge.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/public/app.js

@@ -302,6 +302,7 @@ const STORAGE_KEYS = {
   pwsUrl: 'weather.pwsUrl',
   ambientApiKey: 'weather.ambientApiKey',
   ambientAppKey: 'weather.ambientAppKey',
+  ambientUseStation: 'weather.ambientUseStation',
   alertIdsSeen: 'weather.alertIdsSeen',
 };
 
@@ -348,6 +349,7 @@ const state = {
   pwsUrl: localStorage.getItem(STORAGE_KEYS.pwsUrl) || '',
   ambientApiKey: localStorage.getItem(STORAGE_KEYS.ambientApiKey) || '',
   ambientAppKey: localStorage.getItem(STORAGE_KEYS.ambientAppKey) || '',
+  ambientUseStation: localStorage.getItem(STORAGE_KEYS.ambientUseStation) !== 'false',
   ambientDevice: null,
   pushSub: null,
   hourlyExtended: false,
@@ -2696,6 +2698,8 @@ if (ambientSaveBtn) {
         }).catch(() => {});
         const stationName = devices?.[0]?.info?.name || devices?.[0]?.macAddress || 'station';
         if (ambientStatusEl) { ambientStatusEl.textContent = `✓ Connected to ${stationName} — saved for all devices`; show(ambientStatusEl); }
+        const useRow = document.getElementById('ambient-use-row');
+        if (useRow) useRow.style.display = '';
         fetchAmbientStation();
       } else {
         const { error } = await res.json().catch(() => ({}));
@@ -2714,8 +2718,46 @@ fetch('/api/ambient-config').then(r => r.json()).then(({ configured }) => {
     if (ambientStatusEl) { ambientStatusEl.textContent = '✓ Keys configured on server'; show(ambientStatusEl); }
     fetchAmbientStation();
   }
+  if (configured || state.ambientApiKey) {
+    const useRow = document.getElementById('ambient-use-row');
+    if (useRow) useRow.style.display = '';
+  }
 }).catch(() => {});
 
+// ── Ambient "use as primary source" toggle ────────────────────────────────────
+const ambientUseToggle = document.getElementById('ambient-use-toggle');
+if (ambientUseToggle) {
+  ambientUseToggle.checked = state.ambientUseStation;
+  ambientUseToggle.addEventListener('change', () => {
+    state.ambientUseStation = ambientUseToggle.checked;
+    localStorage.setItem(STORAGE_KEYS.ambientUseStation, state.ambientUseStation);
+    if (state.ambientUseStation) {
+      // Re-apply station overlay immediately
+      if (state.ambientDevice) applyStationOverlay(state.ambientDevice);
+    } else {
+      // Restore location name from current city
+      if (state.currentCity) {
+        const locNameEl = document.getElementById('loc-name');
+        const locSubEl = document.getElementById('loc-sub');
+        if (locNameEl) locNameEl.textContent = state.currentCity.name;
+        if (locSubEl) locSubEl.textContent = [state.currentCity.admin1, state.currentCity.country].filter(Boolean).join(', ');
+      }
+      // Show station badge so user knows station is still fetching but not overriding
+      if (state.ambientDevice) {
+        const badge = document.getElementById('station-badge');
+        const badgeName = document.getElementById('station-badge-name');
+        if (badge) { if (badgeName) badgeName.textContent = state.ambientDevice.info?.name || 'My Station'; show(badge); }
+      }
+    }
+  });
+}
+
+// Show toggle row if keys are already saved locally
+if (state.ambientApiKey && state.ambientAppKey) {
+  const useRow = document.getElementById('ambient-use-row');
+  if (useRow) useRow.style.display = '';
+}
+
 const pwsUrlInput = document.getElementById('pws-url-input');
 const pwsSaveBtn = document.getElementById('pws-save-btn');
 const pwsStatusEl = document.getElementById('pws-status');
@@ -2879,6 +2921,7 @@ async function fetchAmbientStation() {
 
 function applyStationOverlay(device) {
   if (!device) return;
+  if (!state.ambientUseStation) return;
   const data = device.lastData || {};
   if (!data.dateutc || Date.now() - data.dateutc > 15 * 60 * 1000) return; // stale > 15 min
 
@@ -2948,13 +2991,16 @@ function applyStationOverlay(device) {
     peekEl.textContent = `· ${fS(data.windspeedmph)} ${speedUnit()} ${compassDir(data.winddir || 0)} · ${data.humidity ?? '--'}% humidity`;
   }
 
-  // Station badge
+  // Replace location name with station name
+  const stationName = device.info?.name || device.macAddress || 'My Station';
+  const locNameEl = document.getElementById('loc-name');
+  const locSubEl = document.getElementById('loc-sub');
+  if (locNameEl) locNameEl.textContent = stationName;
+  if (locSubEl) locSubEl.textContent = 'Ambient Weather Station';
+
+  // Hide the hero badge (redundant — location header now identifies the station)
   const badge = document.getElementById('station-badge');
-  const badgeName = document.getElementById('station-badge-name');
-  if (badge) {
-    if (badgeName) badgeName.textContent = device.info?.name || 'My Station';
-    show(badge);
-  }
+  if (badge) hide(badge);
 }
 
 function renderAmbientStation(device) {

app/public/index.html

@@ -601,6 +601,13 @@
         <p class="settings-help">From ambientweather.net → Account → API Keys. Keys are stored locally in your browser.</p>
         <p id="ambient-status" class="settings-help hidden"></p>
       </div>
+      <div class="settings-row" id="ambient-use-row" style="display:none">
+        <span class="settings-label">Use as primary source</span>
+        <label class="switch-toggle">
+          <input id="ambient-use-toggle" type="checkbox" checked>
+          <span class="toggle-slider"></span>
+        </label>
+      </div>
 
       <div class="settings-section-title">Personal Weather Station</div>
       <div class="settings-row settings-row--block">