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/dashboard.html

@@ -384,7 +384,7 @@ input, select, textarea { font-size: 16px; } /* stops iOS zooming in on focus */
   </div>
   <div class="header-right">
     <span class="station-name" id="stationName"></span>
-    <a href="/conditions" class="logout">Conditions</a>
+    <a href="/?tab=station" class="logout">Station</a>
     <a href="/" class="logout">← Weather</a>
     <a href="/dashboard/settings" class="logout">Settings</a>
     <a href="/dashboard/logout" class="logout">Sign out</a>