Merge /conditions into the app as a Station tab

- New Station tab (top tabs, bottom nav, swipe order) carrying the old /conditions look:
  radar-ring hero, condition pill, wind compass, atmosphere/precip/solar cards, indoor
- Scoped sl-* styles and station-live.js; units follow the app's metric/imperial setting
- Empty/error states when no station is connected
- /conditions now 301-redirects to /?tab=station; removed conditions.html,
  /api/conditions/public and the old My Station drawer
- /api/ambient-config also returns the station name
- Dashboard and settings links updated; SW cache v8; manifest shortcut for Station
- Drops an indoor-temp block in applyStationOverlay that referenced an out-of-scope helper

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/public/manifest.json

@@ -43,6 +43,13 @@
       "url": "/?tab=conditions",
       "icons": [{ "src": "/icons/icon-192.png", "sizes": "192x192" }]
     },
+    {
+      "name": "My Station",
+      "short_name": "Station",
+      "description": "Live readings from your weather station",
+      "url": "/?tab=station",
+      "icons": [{ "src": "/icons/icon-192.png", "sizes": "192x192" }]
+    },
     {
       "name": "Radar Map",
       "short_name": "Map",