fix: environment widget alignment and sun position night labels

- Consistent 170px minHeight across Weather, Air Quality, Forecast widgets
- Swap sunrise/sunset labels at night to match arc direction
- Weather header shows "Weather" instead of location

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lib/shared/widgets/sun_position_widget.dart

@@ -122,6 +122,8 @@ class _SunPositionWidgetState extends State<SunPositionWidget> {
             const SizedBox(height: 8),
 
             // Arc with integrated horizon labels
+            // At night: sunset on left (night start), sunrise on right (night end)
+            // During day: sunrise on left (day start), sunset on right (day end)
             SizedBox(
               height: 170,
               child: LayoutBuilder(
@@ -138,15 +140,15 @@ class _SunPositionWidgetState extends State<SunPositionWidget> {
                           ),
                         ),
                       ),
-                      // Sunrise widget at left horizon (10px up for balance)
+                      // Left horizon: Sunrise during day, Sunset at night
                       Positioned(
                         left: 0,
                         bottom: 10,
                         child: _HorizonTimeDisplay(
-                          icon: Icons.wb_twilight,
-                          label: 'Sunrise',
-                          time: _sunrise,
-                          iconColor: Colors.orange,
+                          icon: _isDaytime ? Icons.wb_twilight : Icons.nights_stay,
+                          label: _isDaytime ? 'Sunrise' : 'Sunset',
+                          time: _isDaytime ? _sunrise : _sunset,
+                          iconColor: _isDaytime ? Colors.orange : Colors.deepOrange,
                           alignment: CrossAxisAlignment.start,
                         ),
                       ),
@@ -159,15 +161,15 @@ class _SunPositionWidgetState extends State<SunPositionWidget> {
                           child: _DaylightDisplay(minutes: _daylightMinutes),
                         ),
                       ),
-                      // Sunset widget at right horizon (10px up for balance)
+                      // Right horizon: Sunset during day, Sunrise at night
                       Positioned(
                         right: 0,
                         bottom: 10,
                         child: _HorizonTimeDisplay(
-                          icon: Icons.nights_stay,
-                          label: 'Sunset',
-                          time: _sunset,
-                          iconColor: Colors.deepOrange,
+                          icon: _isDaytime ? Icons.nights_stay : Icons.wb_twilight,
+                          label: _isDaytime ? 'Sunset' : 'Sunrise',
+                          time: _isDaytime ? _sunset : _sunrise,
+                          iconColor: _isDaytime ? Colors.deepOrange : Colors.orange,
                           alignment: CrossAxisAlignment.end,
                         ),
                       ),