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/style.css

@@ -2532,20 +2532,6 @@ body.map-fs #unified-map {
 
 
 /* ── My Station (Ambient Weather) ──────────────────────────────────────────── */
-.station-drawer { margin-top: 1rem; }
-.station-drawer-peek { font-size: 0.8rem; color: var(--ink-light); margin-left: 0.5rem; font-weight: 400; }
-.station-loading { color: var(--ink-light); font-size: 0.9rem; padding: 0.5rem 0; }
-.station-error { color: #e57373; font-size: 0.88rem; padding: 0.4rem 0; }
-.station-name-row {
-  display: flex;
-  align-items: baseline;
-  gap: 0.6rem;
-  margin-bottom: 0.75rem;
-  flex-wrap: wrap;
-}
-.station-name { font-weight: 600; font-size: 0.95rem; }
-.station-updated { font-size: 0.75rem; color: var(--ink-light); }
-
 .station-badge {
   display: inline-flex;
   align-items: center;