chore: release v1.5.0

feat: add dynamic environment widgets

Add live weather, sun position, and forecast widgets to Front Hall dashboard,
powered by data from the Qdrant volatile collection via core-api.

New widgets:
- SunPositionWidget: Animated arc showing sun/moon position with gradient colors
- ForecastWidget: Multi-day weather outlook
- Updated WeatherWidget and AirQualityWidget to accept API data

Infrastructure:
- Environment datasource calling GET /tools/environment
- Environment provider with 5-minute auto-refresh
- Freezed models for environment data

Tests:
- 12 widget tests for environment section
- Updated existing tests with givenEnvironment() harness method

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

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

test/harness/test_harness.dart

@@ -172,6 +172,16 @@ class TestHarness {
     api.whenGet('/tools/system/stats', stats ?? Fixtures.systemStats);
   }
 
+  /// Set up mock environment response.
+  void givenEnvironment([Map<String, dynamic>? environment]) {
+    api.whenGet('/tools/environment', environment ?? Fixtures.environment);
+  }
+
+  /// Set up mock environment response without air quality.
+  void givenEnvironmentNoAirQuality() {
+    api.whenGet('/tools/environment', Fixtures.environmentNoAirQuality);
+  }
+
   /// Set up theme mode.
   void givenThemeMode(ThemeMode mode) {
     _themeMode = mode;