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>

lib/shared/widgets/air_quality_widget.dart

@@ -1,17 +1,24 @@
 import 'package:flutter/material.dart';
+import 'package:tatlock_ui/features/front_hall/data/models/environment_model.dart'
+    as api;
 import 'package:tatlock_ui/shared/theme/stoplight_colors.dart';
 
 /// Air Quality Index widget displaying current AQI.
 ///
-/// Currently uses mock data. Will be connected to air quality API in future.
+/// Displays air quality data from the Core API environment endpoint.
+/// Only render this widget when air quality data is available.
 class AirQualityWidget extends StatelessWidget {
   const AirQualityWidget({
     super.key,
+    this.apiData,
     this.data,
     this.compact = false,
   });
 
-  /// Air quality data to display. Uses mock data if null.
+  /// Air quality data from API. Takes priority over legacy data.
+  final api.AirQualityData? apiData;
+
+  /// Legacy air quality data to display. Uses mock data if null.
   final AirQualityData? data;
 
   /// Whether to use compact layout.
@@ -20,7 +27,11 @@ class AirQualityWidget extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
-    final aqi = data ?? AirQualityData.mock();
+
+    // Convert API data to local model, or use legacy data
+    final aqi = apiData != null
+        ? _fromApiData(apiData!)
+        : (data ?? AirQualityData.mock());
 
     if (compact) {
       return _buildCompact(context, colorScheme, aqi);
@@ -199,6 +210,31 @@ class _PollutantChip extends StatelessWidget {
   }
 }
 
+/// Converts API air quality data to local AirQualityData model.
+AirQualityData _fromApiData(api.AirQualityData data) {
+  final index = data.aqi ?? 0;
+  final pollutants = <Pollutant>[];
+
+  if (data.pm25 != null) {
+    pollutants.add(Pollutant(name: 'PM2.5', value: data.pm25!, unit: 'µg/m³'));
+  }
+  if (data.pm10 != null) {
+    pollutants.add(Pollutant(name: 'PM10', value: data.pm10!, unit: 'µg/m³'));
+  }
+  if (data.o3 != null) {
+    pollutants.add(Pollutant(name: 'O₃', value: data.o3!, unit: 'ppb'));
+  }
+  if (data.no2 != null) {
+    pollutants.add(Pollutant(name: 'NO₂', value: data.no2!, unit: 'ppb'));
+  }
+
+  return AirQualityData(
+    index: index,
+    level: AqiLevel.fromIndex(index),
+    pollutants: pollutants,
+  );
+}
+
 /// Air Quality Index levels based on US EPA standard.
 enum AqiLevel {
   good(