Add AI-powered insights using Apple Foundation Models

- Replace static insights with on-device AI generation via FoundationModels framework
- Add @Generable AIInsight model for structured LLM output
- Create FoundationModelsInsightService with session-per-request for concurrent generation
- Add MoodDataSummarizer to prepare mood data for AI analysis
- Implement loading states with skeleton UI and pull-to-refresh
- Add AI availability badge and error handling
- Support default (supportive) and rude (sarcastic) personality modes
- Optimize prompts to fit within 4096 token context limit
- Bump iOS deployment target to 26.0 for Foundation Models support

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

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

Feels.xcodeproj/project.pbxproj

@@ -657,7 +657,7 @@
 				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
 				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPad = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
 				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPhone = "UIInterfaceOrientationPortrait UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
-				IPHONEOS_DEPLOYMENT_TARGET = 18.6;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -693,7 +693,7 @@
 				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
 				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPad = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
 				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPhone = "UIInterfaceOrientationPortrait UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
-				IPHONEOS_DEPLOYMENT_TARGET = 18.6;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",

Shared/Models/AIInsight.swift

@@ -0,0 +1,68 @@
+//
+//  AIInsight.swift
+//  Feels
+//
+//  Created by Claude Code on 12/13/24.
+//
+
+import Foundation
+import FoundationModels
+
+/// Represents a single AI-generated insight using @Generable for structured LLM output
+@Generable
+struct AIInsight: Equatable {
+    @Guide(description: "A brief, engaging title for the insight (3-6 words)")
+    var title: String
+
+    @Guide(description: "A detailed, personalized description of the insight (1-2 sentences)")
+    var description: String
+
+    @Guide(description: "The type of insight: pattern (observed trend), advice (recommendation), prediction (future forecast), achievement (milestone), or trend (direction analysis)")
+    var insightType: String
+
+    @Guide(description: "The primary mood associated with this insight: great, good, average, bad, horrible, or none")
+    var associatedMood: String
+
+    @Guide(description: "SF Symbol name for the insight icon (e.g., star.fill, chart.line.uptrend.xyaxis, heart.fill)")
+    var iconName: String
+
+    @Guide(description: "Sentiment of the insight: positive, neutral, or negative")
+    var sentiment: String
+}
+
+/// Container for period-specific insights - the LLM generates this structure
+@Generable
+struct AIInsightsResponse: Equatable {
+    @Guide(description: "Array of exactly 5 diverse insights covering patterns, advice, and predictions")
+    var insights: [AIInsight]
+}
+
+// MARK: - Conversion to App's Insight Model
+
+extension AIInsight {
+    /// Converts AI-generated insight to the app's existing Insight model
+    func toInsight() -> Insight {
+        let mood: Mood? = switch associatedMood.lowercased() {
+        case "great": .great
+        case "good": .good
+        case "average": .average
+        case "bad": .bad
+        case "horrible": .horrible
+        default: nil
+        }
+
+        return Insight(
+            icon: iconName,
+            title: title,
+            description: description,
+            mood: mood
+        )
+    }
+}
+
+extension AIInsightsResponse {
+    /// Converts all AI insights to app's Insight models
+    func toInsights() -> [Insight] {
+        insights.map { $0.toInsight() }
+    }
+}

Shared/Services/FoundationModelsInsightService.swift

@@ -0,0 +1,219 @@
+//
+//  FoundationModelsInsightService.swift
+//  Feels
+//
+//  Created by Claude Code on 12/13/24.
+//
+
+import Foundation
+import FoundationModels
+
+/// Error types for insight generation
+enum InsightGenerationError: Error, LocalizedError {
+    case modelUnavailable(reason: String)
+    case insufficientData
+    case generationFailed(underlying: Error)
+    case invalidResponse
+
+    var errorDescription: String? {
+        switch self {
+        case .modelUnavailable(let reason):
+            return "AI insights unavailable: \(reason)"
+        case .insufficientData:
+            return "Not enough mood data to generate insights"
+        case .generationFailed(let error):
+            return "Failed to generate insights: \(error.localizedDescription)"
+        case .invalidResponse:
+            return "Unable to parse AI response"
+        }
+    }
+}
+
+/// Service responsible for generating AI-powered mood insights using Apple's Foundation Models
+@MainActor
+class FoundationModelsInsightService: ObservableObject {
+
+    // MARK: - Published State
+
+    @Published private(set) var isAvailable: Bool = false
+    @Published private(set) var isGenerating: Bool = false
+    @Published private(set) var lastError: InsightGenerationError?
+
+    // MARK: - Dependencies
+
+    private let summarizer = MoodDataSummarizer()
+
+    // MARK: - Cache
+
+    private var cachedInsights: [String: (insights: [Insight], timestamp: Date)] = [:]
+    private let cacheValidityDuration: TimeInterval = 3600 // 1 hour
+
+    // MARK: - Initialization
+
+    init() {
+        checkAvailability()
+    }
+
+    /// Check if Foundation Models is available on this device
+    func checkAvailability() {
+        let model = SystemLanguageModel.default
+        switch model.availability {
+        case .available:
+            isAvailable = true
+        case .unavailable(let reason):
+            isAvailable = false
+            lastError = .modelUnavailable(reason: describeUnavailability(reason))
+        @unknown default:
+            isAvailable = false
+            lastError = .modelUnavailable(reason: "Unknown availability status")
+        }
+    }
+
+    private func describeUnavailability(_ reason: SystemLanguageModel.Availability.UnavailableReason) -> String {
+        switch reason {
+        case .deviceNotEligible:
+            return "This device doesn't support Apple Intelligence"
+        case .appleIntelligenceNotEnabled:
+            return "Apple Intelligence is not enabled in Settings"
+        case .modelNotReady:
+            return "The AI model is still downloading"
+        @unknown default:
+            return "AI features are not available"
+        }
+    }
+
+    /// Creates a new session for each request to allow concurrent generation
+    private func createSession() -> LanguageModelSession {
+        LanguageModelSession(instructions: systemInstructions)
+    }
+
+    // MARK: - System Instructions
+
+    private var systemInstructions: String {
+        let personalityPack = UserDefaultsStore.personalityPackable()
+
+        switch personalityPack {
+        case .Default:
+            return defaultSystemInstructions
+        case .Rude:
+            return rudeSystemInstructions
+        }
+    }
+
+    private var defaultSystemInstructions: String {
+        """
+        You are a supportive mood analyst for the Feels app. Analyze mood data and provide warm, actionable insights.
+
+        Style: Encouraging, empathetic, concise (1-2 sentences per insight). Reference specific data.
+
+        SF Symbols: star.fill, sun.max.fill, heart.fill, chart.line.uptrend.xyaxis, trophy.fill, calendar, leaf.fill, sparkles
+        """
+    }
+
+    private var rudeSystemInstructions: String {
+        """
+        You are a brutally honest, sarcastic mood analyst. Think: judgmental friend meets disappointed therapist.
+
+        Style: Backhanded compliments, dramatic disappointment, weaponize their own data against them. Use "Oh honey," "Congratulations," and "Shocking" sarcastically. Mock patterns, not pain.
+
+        Examples: "THREE whole good days? Trophy's in the mail." / "Mondays destroy you. Revolutionary." / "Your mood tanks Sundays. Almost like you hate your job."
+
+        SF Symbols: eye.fill, trophy.fill, flame.fill, exclamationmark.triangle.fill, theatermasks.fill, crown.fill
+        """
+    }
+
+    // MARK: - Insight Generation
+
+    /// Generate AI-powered insights for the given mood entries
+    /// - Parameters:
+    ///   - entries: Array of mood entries to analyze
+    ///   - periodName: The time period name (e.g., "this month", "this year", "all time")
+    ///   - count: Number of insights to generate (default 5)
+    /// - Returns: Array of Insight objects
+    func generateInsights(
+        for entries: [MoodEntryModel],
+        periodName: String,
+        count: Int = 5
+    ) async throws -> [Insight] {
+        // Check cache first
+        if let cached = cachedInsights[periodName],
+           Date().timeIntervalSince(cached.timestamp) < cacheValidityDuration {
+            return cached.insights
+        }
+
+        guard isAvailable else {
+            throw InsightGenerationError.modelUnavailable(reason: lastError?.localizedDescription ?? "Model not available")
+        }
+
+        // Create a new session for this request to allow concurrent generation
+        let session = createSession()
+
+        // Filter valid entries
+        let validEntries = entries.filter { ![.missing, .placeholder].contains($0.mood) }
+
+        guard !validEntries.isEmpty else {
+            throw InsightGenerationError.insufficientData
+        }
+
+        isGenerating = true
+        defer { isGenerating = false }
+
+        // Prepare data summary
+        let summary = summarizer.summarize(entries: validEntries, periodName: periodName)
+        let prompt = buildPrompt(from: summary, count: count)
+
+        do {
+            let response = try await session.respond(
+                to: prompt,
+                generating: AIInsightsResponse.self
+            )
+
+            let insights = response.content.insights.map { $0.toInsight() }
+
+            // Cache results
+            cachedInsights[periodName] = (insights, Date())
+
+            return insights
+        } catch {
+            // Log detailed error for debugging
+            print("❌ AI Insight generation failed for '\(periodName)': \(error)")
+            print("   Error type: \(type(of: error))")
+            print("   Localized: \(error.localizedDescription)")
+
+            lastError = .generationFailed(underlying: error)
+            throw lastError!
+        }
+    }
+
+    // MARK: - Prompt Construction
+
+    private func buildPrompt(from summary: MoodDataSummary, count: Int) -> String {
+        let dataSection = summarizer.toPromptString(summary)
+
+        return """
+        Analyze this mood data and generate \(count) insights:
+
+        \(dataSection)
+
+        Include: 1 pattern, 1 advice, 1 prediction, and other varied insights. Reference specific data points.
+        """
+    }
+
+    // MARK: - Cache Management
+
+    /// Invalidate all cached insights
+    func invalidateCache() {
+        cachedInsights.removeAll()
+    }
+
+    /// Invalidate cached insights for a specific period
+    func invalidateCache(for periodName: String) {
+        cachedInsights.removeValue(forKey: periodName)
+    }
+
+    /// Check if insights are cached for a period
+    func hasCachedInsights(for periodName: String) -> Bool {
+        guard let cached = cachedInsights[periodName] else { return false }
+        return Date().timeIntervalSince(cached.timestamp) < cacheValidityDuration
+    }
+}

Shared/Services/MoodDataSummarizer.swift

@@ -0,0 +1,389 @@
+//
+//  MoodDataSummarizer.swift
+//  Feels
+//
+//  Created by Claude Code on 12/13/24.
+//
+
+import Foundation
+
+/// Summary of mood data for a specific time period, formatted for AI consumption
+struct MoodDataSummary {
+    let periodName: String
+    let totalEntries: Int
+    let dateRange: String
+
+    // Mood distribution
+    let moodCounts: [String: Int]
+    let moodPercentages: [String: Int]
+    let averageMoodScore: Double
+
+    // Temporal patterns
+    let weekdayAverages: [String: Double]
+    let weekendAverage: Double
+    let weekdayAverage: Double
+    let bestDayOfWeek: String
+    let worstDayOfWeek: String
+
+    // Trends
+    let recentTrend: String
+    let trendMagnitude: Double
+
+    // Streaks
+    let currentLoggingStreak: Int
+    let longestLoggingStreak: Int
+    let longestPositiveStreak: Int
+    let longestNegativeStreak: Int
+
+    // Variability
+    let moodSwingCount: Int
+    let moodStabilityScore: Double
+
+    // Recent context
+    let last7DaysAverage: Double
+    let last7DaysMoods: [String]
+
+    // Notable observations
+    let hasAllMoodTypes: Bool
+    let missingMoodTypes: [String]
+}
+
+/// Transforms raw MoodEntryModel data into AI-optimized summaries
+class MoodDataSummarizer {
+    private let calendar = Calendar.current
+    private let dateFormatter: DateFormatter = {
+        let formatter = DateFormatter()
+        formatter.dateStyle = .medium
+        return formatter
+    }()
+
+    // MARK: - Main Summarization
+
+    func summarize(entries: [MoodEntryModel], periodName: String) -> MoodDataSummary {
+        let validEntries = entries.filter { ![.missing, .placeholder].contains($0.mood) }
+
+        guard !validEntries.isEmpty else {
+            return emptyDataSummary(periodName: periodName)
+        }
+
+        let sortedEntries = validEntries.sorted { $0.forDate < $1.forDate }
+
+        // Calculate all metrics
+        let moodDistribution = calculateMoodDistribution(entries: validEntries)
+        let temporalPatterns = calculateTemporalPatterns(entries: validEntries)
+        let trend = calculateTrend(entries: sortedEntries)
+        let streaks = calculateStreaks(entries: sortedEntries)
+        let variability = calculateVariability(entries: sortedEntries)
+        let recentContext = calculateRecentContext(entries: sortedEntries)
+        let moodTypes = calculateMoodTypes(entries: validEntries)
+
+        // Format date range
+        let dateRange = formatDateRange(entries: sortedEntries)
+
+        return MoodDataSummary(
+            periodName: periodName,
+            totalEntries: validEntries.count,
+            dateRange: dateRange,
+            moodCounts: moodDistribution.counts,
+            moodPercentages: moodDistribution.percentages,
+            averageMoodScore: moodDistribution.average,
+            weekdayAverages: temporalPatterns.weekdayAverages,
+            weekendAverage: temporalPatterns.weekendAverage,
+            weekdayAverage: temporalPatterns.weekdayAverage,
+            bestDayOfWeek: temporalPatterns.bestDay,
+            worstDayOfWeek: temporalPatterns.worstDay,
+            recentTrend: trend.direction,
+            trendMagnitude: trend.magnitude,
+            currentLoggingStreak: streaks.current,
+            longestLoggingStreak: streaks.longest,
+            longestPositiveStreak: streaks.longestPositive,
+            longestNegativeStreak: streaks.longestNegative,
+            moodSwingCount: variability.swingCount,
+            moodStabilityScore: variability.stabilityScore,
+            last7DaysAverage: recentContext.average,
+            last7DaysMoods: recentContext.moods,
+            hasAllMoodTypes: moodTypes.hasAll,
+            missingMoodTypes: moodTypes.missing
+        )
+    }
+
+    // MARK: - Mood Distribution
+
+    private func calculateMoodDistribution(entries: [MoodEntryModel]) -> (counts: [String: Int], percentages: [String: Int], average: Double) {
+        var counts: [String: Int] = [:]
+        var totalScore = 0
+
+        for entry in entries {
+            let moodName = entry.mood.widgetDisplayName.lowercased()
+            counts[moodName, default: 0] += 1
+            totalScore += Int(entry.moodValue)
+        }
+
+        var percentages: [String: Int] = [:]
+        for (mood, count) in counts {
+            percentages[mood] = Int((Double(count) / Double(entries.count)) * 100)
+        }
+
+        let average = Double(totalScore) / Double(entries.count)
+
+        return (counts, percentages, average)
+    }
+
+    // MARK: - Temporal Patterns
+
+    private func calculateTemporalPatterns(entries: [MoodEntryModel]) -> (weekdayAverages: [String: Double], weekendAverage: Double, weekdayAverage: Double, bestDay: String, worstDay: String) {
+        let weekdayNames = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
+        var weekdayTotals: [Int: (total: Int, count: Int)] = [:]
+
+        for entry in entries {
+            let weekday = Int(entry.weekDay)
+            let current = weekdayTotals[weekday, default: (0, 0)]
+            weekdayTotals[weekday] = (current.total + Int(entry.moodValue), current.count + 1)
+        }
+
+        var weekdayAverages: [String: Double] = [:]
+        var bestDay = "Monday"
+        var worstDay = "Monday"
+        var bestAvg = -1.0
+        var worstAvg = 5.0
+
+        for (weekday, data) in weekdayTotals {
+            let avg = Double(data.total) / Double(data.count)
+            let dayName = weekdayNames[weekday - 1]
+            weekdayAverages[dayName] = avg
+
+            if avg > bestAvg {
+                bestAvg = avg
+                bestDay = dayName
+            }
+            if avg < worstAvg {
+                worstAvg = avg
+                worstDay = dayName
+            }
+        }
+
+        // Weekend vs weekday
+        let weekendEntries = entries.filter { [1, 7].contains(Int($0.weekDay)) }
+        let weekdayEntries = entries.filter { ![1, 7].contains(Int($0.weekDay)) }
+
+        let weekendAvg = weekendEntries.isEmpty ? 0 : Double(weekendEntries.reduce(0) { $0 + Int($1.moodValue) }) / Double(weekendEntries.count)
+        let weekdayAvg = weekdayEntries.isEmpty ? 0 : Double(weekdayEntries.reduce(0) { $0 + Int($1.moodValue) }) / Double(weekdayEntries.count)
+
+        return (weekdayAverages, weekendAvg, weekdayAvg, bestDay, worstDay)
+    }
+
+    // MARK: - Trend Analysis
+
+    private func calculateTrend(entries: [MoodEntryModel]) -> (direction: String, magnitude: Double) {
+        guard entries.count >= 4 else {
+            return ("stable", 0.0)
+        }
+
+        let halfCount = entries.count / 2
+        let firstHalf = Array(entries.prefix(halfCount))
+        let secondHalf = Array(entries.suffix(halfCount))
+
+        let firstAvg = Double(firstHalf.reduce(0) { $0 + Int($1.moodValue) }) / Double(firstHalf.count)
+        let secondAvg = Double(secondHalf.reduce(0) { $0 + Int($1.moodValue) }) / Double(secondHalf.count)
+
+        let diff = secondAvg - firstAvg
+
+        let direction: String
+        if diff > 0.5 {
+            direction = "improving"
+        } else if diff < -0.5 {
+            direction = "declining"
+        } else {
+            direction = "stable"
+        }
+
+        return (direction, abs(diff))
+    }
+
+    // MARK: - Streak Calculations
+
+    private func calculateStreaks(entries: [MoodEntryModel]) -> (current: Int, longest: Int, longestPositive: Int, longestNegative: Int) {
+        let sortedByDateDesc = entries.sorted { $0.forDate > $1.forDate }
+
+        // Current logging streak
+        var currentStreak = 0
+        let today = calendar.startOfDay(for: Date())
+
+        if let mostRecent = sortedByDateDesc.first?.forDate {
+            let yesterday = calendar.date(byAdding: .day, value: -1, to: today)!
+
+            if calendar.isDate(mostRecent, inSameDayAs: today) || calendar.isDate(mostRecent, inSameDayAs: yesterday) {
+                currentStreak = 1
+                var checkDate = calendar.date(byAdding: .day, value: -1, to: mostRecent)!
+
+                for entry in sortedByDateDesc.dropFirst() {
+                    if calendar.isDate(entry.forDate, inSameDayAs: checkDate) {
+                        currentStreak += 1
+                        checkDate = calendar.date(byAdding: .day, value: -1, to: checkDate)!
+                    } else {
+                        break
+                    }
+                }
+            }
+        }
+
+        // Longest logging streak
+        var longestStreak = 1
+        var tempStreak = 1
+        let sortedByDateAsc = entries.sorted { $0.forDate < $1.forDate }
+
+        for i in 1..<sortedByDateAsc.count {
+            let dayDiff = calendar.dateComponents([.day], from: sortedByDateAsc[i-1].forDate, to: sortedByDateAsc[i].forDate).day ?? 0
+            if dayDiff == 1 {
+                tempStreak += 1
+                longestStreak = max(longestStreak, tempStreak)
+            } else {
+                tempStreak = 1
+            }
+        }
+
+        // Positive mood streak (good/great)
+        let longestPositive = calculateMoodStreak(entries: sortedByDateAsc, moods: [.good, .great])
+
+        // Negative mood streak (bad/horrible)
+        let longestNegative = calculateMoodStreak(entries: sortedByDateAsc, moods: [.bad, .horrible])
+
+        return (currentStreak, longestStreak, longestPositive, longestNegative)
+    }
+
+    private func calculateMoodStreak(entries: [MoodEntryModel], moods: [Mood]) -> Int {
+        var longest = 0
+        var current = 0
+
+        for entry in entries {
+            if moods.contains(entry.mood) {
+                current += 1
+                longest = max(longest, current)
+            } else {
+                current = 0
+            }
+        }
+
+        return longest
+    }
+
+    // MARK: - Variability
+
+    private func calculateVariability(entries: [MoodEntryModel]) -> (swingCount: Int, stabilityScore: Double) {
+        guard entries.count >= 2 else {
+            return (0, 1.0)
+        }
+
+        var swings = 0
+        for i in 1..<entries.count {
+            let diff = abs(Int(entries[i].moodValue) - Int(entries[i-1].moodValue))
+            if diff >= 2 {
+                swings += 1
+            }
+        }
+
+        let swingRate = Double(swings) / Double(entries.count - 1)
+        let stabilityScore = 1.0 - min(swingRate, 1.0)
+
+        return (swings, stabilityScore)
+    }
+
+    // MARK: - Recent Context
+
+    private func calculateRecentContext(entries: [MoodEntryModel]) -> (average: Double, moods: [String]) {
+        let recentEntries = entries.suffix(7)
+
+        guard !recentEntries.isEmpty else {
+            return (0, [])
+        }
+
+        let average = Double(recentEntries.reduce(0) { $0 + Int($1.moodValue) }) / Double(recentEntries.count)
+        let moods = recentEntries.map { $0.mood.widgetDisplayName }
+
+        return (average, moods)
+    }
+
+    // MARK: - Mood Types
+
+    private func calculateMoodTypes(entries: [MoodEntryModel]) -> (hasAll: Bool, missing: [String]) {
+        let allMoods: Set<Mood> = [.great, .good, .average, .bad, .horrible]
+        let presentMoods = Set(entries.map { $0.mood })
+
+        let missing = allMoods.subtracting(presentMoods).map { $0.widgetDisplayName }
+        let hasAll = missing.isEmpty
+
+        return (hasAll, missing)
+    }
+
+    // MARK: - Helpers
+
+    private func formatDateRange(entries: [MoodEntryModel]) -> String {
+        guard let first = entries.first, let last = entries.last else {
+            return "No data"
+        }
+
+        let startDate = dateFormatter.string(from: first.forDate)
+        let endDate = dateFormatter.string(from: last.forDate)
+
+        return "\(startDate) - \(endDate)"
+    }
+
+    private func emptyDataSummary(periodName: String) -> MoodDataSummary {
+        MoodDataSummary(
+            periodName: periodName,
+            totalEntries: 0,
+            dateRange: "No data",
+            moodCounts: [:],
+            moodPercentages: [:],
+            averageMoodScore: 0,
+            weekdayAverages: [:],
+            weekendAverage: 0,
+            weekdayAverage: 0,
+            bestDayOfWeek: "N/A",
+            worstDayOfWeek: "N/A",
+            recentTrend: "stable",
+            trendMagnitude: 0,
+            currentLoggingStreak: 0,
+            longestLoggingStreak: 0,
+            longestPositiveStreak: 0,
+            longestNegativeStreak: 0,
+            moodSwingCount: 0,
+            moodStabilityScore: 1.0,
+            last7DaysAverage: 0,
+            last7DaysMoods: [],
+            hasAllMoodTypes: false,
+            missingMoodTypes: ["great", "good", "average", "bad", "horrible"]
+        )
+    }
+
+    // MARK: - Prompt String Generation
+
+    /// Generates a concise prompt string optimized for Apple's 4096 token context limit
+    func toPromptString(_ summary: MoodDataSummary) -> String {
+        // Compact format to stay under token limit
+        var lines: [String] = []
+
+        lines.append("Period: \(summary.periodName), \(summary.totalEntries) entries, avg \(String(format: "%.1f", summary.averageMoodScore))/4")
+
+        // Mood distribution - compact
+        let moodDist = summary.moodPercentages.sorted { $0.key < $1.key }
+            .map { "\($0.key): \($0.value)%" }
+            .joined(separator: ", ")
+        lines.append("Moods: \(moodDist)")
+
+        // Day patterns - only best/worst
+        lines.append("Best day: \(summary.bestDayOfWeek), Worst: \(summary.worstDayOfWeek)")
+        lines.append("Weekend avg: \(String(format: "%.1f", summary.weekendAverage)), Weekday avg: \(String(format: "%.1f", summary.weekdayAverage))")
+
+        // Trends
+        lines.append("Trend: \(summary.recentTrend), Last 7 days avg: \(String(format: "%.1f", summary.last7DaysAverage))")
+
+        // Streaks - compact
+        lines.append("Streaks - Current: \(summary.currentLoggingStreak)d, Longest: \(summary.longestLoggingStreak)d, Best positive: \(summary.longestPositiveStreak)d, Worst negative: \(summary.longestNegativeStreak)d")
+
+        // Stability
+        lines.append("Stability: \(String(format: "%.0f", summary.moodStabilityScore * 100))%, Mood swings: \(summary.moodSwingCount)")
+
+        return lines.joined(separator: "\n")
+    }
+}

Shared/Views/InsightsView/InsightsView.swift

@@ -28,6 +28,27 @@ struct InsightsView: View {
                             .font(.system(size: 28, weight: .bold, design: .rounded))
                             .foregroundColor(textColor)
                         Spacer()
+
+                        // AI badge
+                        if viewModel.isAIAvailable {
+                            HStack(spacing: 4) {
+                                Image(systemName: "sparkles")
+                                    .font(.system(size: 12, weight: .medium))
+                                Text("AI")
+                                    .font(.system(size: 12, weight: .semibold))
+                            }
+                            .foregroundColor(.white)
+                            .padding(.horizontal, 8)
+                            .padding(.vertical, 4)
+                            .background(
+                                LinearGradient(
+                                    colors: [.purple, .blue],
+                                    startPoint: .leading,
+                                    endPoint: .trailing
+                                )
+                            )
+                            .clipShape(Capsule())
+                        }
                     }
                     .padding(.horizontal)
 
@@ -36,6 +57,7 @@ struct InsightsView: View {
                         title: "This Month",
                         icon: "calendar",
                         insights: viewModel.monthInsights,
+                        loadingState: viewModel.monthLoadingState,
                         textColor: textColor,
                         moodTint: moodTint,
                         imagePack: imagePack,
@@ -47,6 +69,7 @@ struct InsightsView: View {
                         title: "This Year",
                         icon: "calendar.badge.clock",
                         insights: viewModel.yearInsights,
+                        loadingState: viewModel.yearLoadingState,
                         textColor: textColor,
                         moodTint: moodTint,
                         imagePack: imagePack,
@@ -58,6 +81,7 @@ struct InsightsView: View {
                         title: "All Time",
                         icon: "infinity",
                         insights: viewModel.allTimeInsights,
+                        loadingState: viewModel.allTimeLoadingState,
                         textColor: textColor,
                         moodTint: moodTint,
                         imagePack: imagePack,
@@ -67,6 +91,11 @@ struct InsightsView: View {
                 .padding(.vertical)
                 .padding(.bottom, 100)
             }
+            .refreshable {
+                viewModel.refreshInsights()
+                // Small delay to show refresh animation
+                try? await Task.sleep(nanoseconds: 500_000_000)
+            }
             .disabled(iapManager.shouldShowPaywall)
 
             if iapManager.shouldShowPaywall {
@@ -108,10 +137,12 @@ struct InsightsView: View {
 }
 
 // MARK: - Insights Section View
+
 struct InsightsSectionView: View {
     let title: String
     let icon: String
     let insights: [Insight]
+    let loadingState: InsightLoadingState
     let textColor: Color
     let moodTint: MoodTints
     let imagePack: MoodImages
@@ -132,6 +163,13 @@ struct InsightsSectionView: View {
                         .font(.system(size: 20, weight: .bold))
                         .foregroundColor(textColor)
 
+                    // Loading indicator in header
+                    if loadingState == .loading {
+                        ProgressView()
+                            .scaleEffect(0.7)
+                            .padding(.leading, 4)
+                    }
+
                     Spacer()
 
                     Image(systemName: isExpanded ? "chevron.up" : "chevron.down")
@@ -145,20 +183,61 @@ struct InsightsSectionView: View {
 
             // Insights List (collapsible)
             if isExpanded {
-                VStack(spacing: 10) {
-                    ForEach(insights) { insight in
-                        InsightCardView(
-                            insight: insight,
-                            textColor: textColor,
-                            moodTint: moodTint,
-                            imagePack: imagePack,
-                            colorScheme: colorScheme
-                        )
+                switch loadingState {
+                case .loading:
+                    // Skeleton loading view
+                    VStack(spacing: 10) {
+                        ForEach(0..<3, id: \.self) { _ in
+                            InsightSkeletonView(colorScheme: colorScheme)
+                        }
                     }
+                    .padding(.horizontal, 16)
+                    .padding(.bottom, 16)
+                    .transition(.opacity)
+
+                case .error:
+                    // Show insights (which contain error message) with error styling
+                    VStack(spacing: 10) {
+                        ForEach(insights) { insight in
+                            InsightCardView(
+                                insight: insight,
+                                textColor: textColor,
+                                moodTint: moodTint,
+                                imagePack: imagePack,
+                                colorScheme: colorScheme
+                            )
+                        }
+                    }
+                    .padding(.horizontal, 16)
+                    .padding(.bottom, 16)
+                    .transition(.opacity.combined(with: .move(edge: .top)))
+
+                case .loaded, .idle:
+                    // Normal insights display with staggered animation
+                    VStack(spacing: 10) {
+                        ForEach(Array(insights.enumerated()), id: \.element.id) { index, insight in
+                            InsightCardView(
+                                insight: insight,
+                                textColor: textColor,
+                                moodTint: moodTint,
+                                imagePack: imagePack,
+                                colorScheme: colorScheme
+                            )
+                            .transition(.asymmetric(
+                                insertion: .opacity.combined(with: .scale(scale: 0.95)).combined(with: .offset(y: 10)),
+                                removal: .opacity
+                            ))
+                            .animation(
+                                .spring(response: 0.4, dampingFraction: 0.8)
+                                .delay(Double(index) * 0.05),
+                                value: insights.count
+                            )
+                        }
+                    }
+                    .padding(.horizontal, 16)
+                    .padding(.bottom, 16)
+                    .transition(.opacity.combined(with: .move(edge: .top)))
                 }
-                .padding(.horizontal, 16)
-                .padding(.bottom, 16)
-                .transition(.opacity.combined(with: .move(edge: .top)))
             }
         }
         .background(
@@ -166,10 +245,60 @@ struct InsightsSectionView: View {
                 .fill(colorScheme == .dark ? Color(.systemGray6) : .white)
         )
         .padding(.horizontal)
+        .animation(.easeInOut(duration: 0.2), value: isExpanded)
+    }
+}
+
+// MARK: - Skeleton Loading View
+
+struct InsightSkeletonView: View {
+    let colorScheme: ColorScheme
+    @State private var isAnimating = false
+
+    var body: some View {
+        HStack(alignment: .top, spacing: 14) {
+            // Icon placeholder
+            Circle()
+                .fill(Color.gray.opacity(0.3))
+                .frame(width: 44, height: 44)
+
+            // Text placeholders
+            VStack(alignment: .leading, spacing: 8) {
+                RoundedRectangle(cornerRadius: 4)
+                    .fill(Color.gray.opacity(0.3))
+                    .frame(width: 120, height: 16)
+
+                RoundedRectangle(cornerRadius: 4)
+                    .fill(Color.gray.opacity(0.2))
+                    .frame(maxWidth: .infinity)
+                    .frame(height: 14)
+
+                RoundedRectangle(cornerRadius: 4)
+                    .fill(Color.gray.opacity(0.2))
+                    .frame(width: 180, height: 14)
+            }
+
+            Spacer()
+        }
+        .padding(14)
+        .background(
+            RoundedRectangle(cornerRadius: 12)
+                .fill(colorScheme == .dark ? Color(.systemGray5) : Color(.systemGray6))
+        )
+        .opacity(isAnimating ? 0.6 : 1.0)
+        .animation(
+            .easeInOut(duration: 0.8)
+            .repeatForever(autoreverses: true),
+            value: isAnimating
+        )
+        .onAppear {
+            isAnimating = true
+        }
     }
 }
 
 // MARK: - Insight Card View
+
 struct InsightCardView: View {
     let insight: Insight
     let textColor: Color