Add weather feature with WeatherKit integration for mood entries

Fetch and display weather data (temp, condition, hi/lo, humidity) when
users log a mood. Weather is stored as JSON on MoodEntryModel and shown
as a card in EntryDetailView. Premium-gated with location permission
prompt. Includes BGTask retry for failed fetches and full analytics.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Shared/Models/MoodEntryModel.swift

@@ -42,6 +42,9 @@ final class MoodEntryModel {
     var notes: String?
     var photoID: UUID?
 
+    // Weather
+    var weatherJSON: String?
+
     // Computed properties
     var mood: Mood {
         Mood(rawValue: moodValue) ?? .missing
@@ -58,7 +61,8 @@ final class MoodEntryModel {
         canEdit: Bool = true,
         canDelete: Bool = true,
         notes: String? = nil,
-        photoID: UUID? = nil
+        photoID: UUID? = nil,
+        weatherJSON: String? = nil
     ) {
         self.forDate = forDate
         self.moodValue = mood.rawValue
@@ -69,6 +73,7 @@ final class MoodEntryModel {
         self.canDelete = canDelete
         self.notes = notes
         self.photoID = photoID
+        self.weatherJSON = weatherJSON
     }
 
     // Convenience initializer for raw values
@@ -81,7 +86,8 @@ final class MoodEntryModel {
         canEdit: Bool = true,
         canDelete: Bool = true,
         notes: String? = nil,
-        photoID: UUID? = nil
+        photoID: UUID? = nil,
+        weatherJSON: String? = nil
     ) {
         self.forDate = forDate
         self.moodValue = moodValue
@@ -92,5 +98,6 @@ final class MoodEntryModel {
         self.canDelete = canDelete
         self.notes = notes
         self.photoID = photoID
+        self.weatherJSON = weatherJSON
     }
 }

Shared/Models/UserDefaultsStore.swift

@@ -207,6 +207,7 @@ class UserDefaultsStore {
         case lockScreenStyle
         case celebrationAnimation
         case hapticFeedbackEnabled
+        case weatherEnabled
 
         case contentViewCurrentSelectedHeaderViewBackDays
         case contentViewHeaderTag

Shared/Models/WeatherData.swift

@@ -0,0 +1,32 @@
+//
+//  WeatherData.swift
+//  Reflect
+//
+//  Codable weather model stored as JSON string in MoodEntryModel.
+//
+
+import Foundation
+
+struct WeatherData: Codable {
+    let conditionSymbol: String    // SF Symbol from WeatherKit (e.g. "cloud.sun.fill")
+    let condition: String          // "Partly Cloudy"
+    let temperature: Double        // Current/average in Celsius
+    let highTemperature: Double    // Day high in Celsius
+    let lowTemperature: Double     // Day low in Celsius
+    let humidity: Double           // 0.0–1.0
+    let latitude: Double
+    let longitude: Double
+    let fetchedAt: Date
+
+    // MARK: - JSON Helpers
+
+    func encode() -> String? {
+        guard let data = try? JSONEncoder().encode(self) else { return nil }
+        return String(data: data, encoding: .utf8)
+    }
+
+    static func decode(from json: String) -> WeatherData? {
+        guard let data = json.data(using: .utf8) else { return nil }
+        return try? JSONDecoder().decode(WeatherData.self, from: data)
+    }
+}