fix: widgets use App Group shared UserDefaults instead of Keychain

- Widgets can't access app's Keychain (different sandbox)
- App writes data to shared UserDefaults (group.com.daniil.pulsehealth)
- Widgets read from shared UserDefaults — no API calls needed
- WidgetDataService: updates widget data + reloads timelines
- DashboardView: pushes habits/tasks data to widget after load
- HealthView: pushes health data to widget after load
- App Group capability added to both app and widget entitlements
- Widgets update every 15 minutes from cached data

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

PulseHealth/PulseHealth.entitlements

@@ -6,9 +6,9 @@
 	<true/>
 	<key>com.apple.developer.healthkit.background-delivery</key>
 	<true/>
-	<key>keychain-access-groups</key>
+	<key>com.apple.security.application-groups</key>
 	<array>
-		<string>$(AppIdentifierPrefix)com.daniil.pulsehealth.shared</string>
+		<string>group.com.daniil.pulsehealth</string>
 	</array>
 </dict>
 </plist>

PulseHealth/Services/WidgetDataService.swift

@@ -0,0 +1,25 @@
+import Foundation
+import WidgetKit
+
+enum WidgetDataService {
+    static let suiteName = "group.com.daniil.pulsehealth"
+
+    static var shared: UserDefaults? {
+        UserDefaults(suiteName: suiteName)
+    }
+
+    static func updateHabits(completed: Int, total: Int, tasksCount: Int) {
+        shared?.set(completed, forKey: "w_habits_completed")
+        shared?.set(total, forKey: "w_habits_total")
+        shared?.set(tasksCount, forKey: "w_tasks_count")
+        WidgetCenter.shared.reloadTimelines(ofKind: "HabitsProgress")
+    }
+
+    static func updateHealth(steps: Int, sleep: Double, heartRate: Int, readiness: Int) {
+        shared?.set(steps, forKey: "w_steps")
+        shared?.set(sleep, forKey: "w_sleep")
+        shared?.set(heartRate, forKey: "w_heart_rate")
+        shared?.set(readiness, forKey: "w_readiness")
+        WidgetCenter.shared.reloadTimelines(ofKind: "HealthSummary")
+    }
+}

PulseHealth/Views/Dashboard/DashboardView.swift

@@ -203,6 +203,11 @@ struct DashboardView: View {
         }
         todayHabits = habits
         isLoading = false
+
+        // Update widget
+        let completed = habits.filter { $0.completedToday == true }.count
+        let activeTasks = todayTasks.filter { !$0.completed }.count
+        WidgetDataService.updateHabits(completed: completed, total: habits.count, tasksCount: activeTasks)
     }
 
     func filterHabitsForToday(_ habits: [Habit]) -> [Habit] {

PulseHealth/Views/Health/HealthView.swift

@@ -200,6 +200,14 @@ struct HealthView: View {
         async let h = HealthAPIService.shared.getHeatmap(days: 7)
         readiness = try? await r; latest = try? await l; heatmapData = (try? await h) ?? []
         isLoading = false
+
+        // Update widget
+        WidgetDataService.updateHealth(
+            steps: latest?.steps?.total ?? 0,
+            sleep: latest?.sleep?.totalSleep ?? 0,
+            heartRate: Int(latest?.restingHeartRate?.value ?? 0),
+            readiness: readiness?.score ?? 0
+        )
     }
 
     func syncHealthKit() async {