Add premium features and reorganize Settings tab

Premium Features:
- Journal notes and photo attachments for mood entries
- Data export (CSV and PDF reports)
- Privacy lock with Face ID/Touch ID
- Apple Health integration for mood correlation
- 4 new personality packs (Motivational Coach, Zen Master, Best Friend, Data Analyst)

Settings Tab Reorganization:
- Combined Customize and Settings into single tab with segmented control
- Added upgrade banner with trial countdown above segment
- "Why Upgrade?" sheet showing all premium benefits
- Subscribe button opens improved StoreKit 2 subscription view

UI Improvements:
- Enhanced subscription store with feature highlights
- Entry detail view for viewing/editing notes and photos
- Removed duplicate subscription banners from tab content

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

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

Shared/Views/LockScreenView.swift

@@ -0,0 +1,105 @@
+//
+//  LockScreenView.swift
+//  Feels
+//
+//  Lock screen shown when privacy lock is enabled and app needs authentication.
+//
+
+import SwiftUI
+
+struct LockScreenView: View {
+
+    @ObservedObject var authManager: BiometricAuthManager
+    @State private var showError = false
+
+    var body: some View {
+        ZStack {
+            // Background gradient
+            LinearGradient(
+                colors: [
+                    Color(.systemBackground),
+                    Color(.systemGray6)
+                ],
+                startPoint: .top,
+                endPoint: .bottom
+            )
+            .ignoresSafeArea()
+
+            VStack(spacing: 40) {
+                Spacer()
+
+                // App icon / lock icon
+                VStack(spacing: 20) {
+                    Image(systemName: "lock.fill")
+                        .font(.system(size: 60))
+                        .foregroundStyle(.secondary)
+
+                    Text("Feels is Locked")
+                        .font(.title2)
+                        .fontWeight(.semibold)
+
+                    Text("Authenticate to access your mood data")
+                        .font(.subheadline)
+                        .foregroundStyle(.secondary)
+                        .multilineTextAlignment(.center)
+                }
+
+                Spacer()
+
+                // Unlock button
+                Button {
+                    Task {
+                        let success = await authManager.authenticate()
+                        if !success {
+                            showError = true
+                        }
+                    }
+                } label: {
+                    HStack(spacing: 12) {
+                        Image(systemName: authManager.biometricIcon)
+                            .font(.title2)
+
+                        Text("Unlock with \(authManager.biometricName)")
+                            .fontWeight(.medium)
+                    }
+                    .frame(maxWidth: .infinity)
+                    .padding(.vertical, 16)
+                    .background(Color.accentColor)
+                    .foregroundColor(.white)
+                    .clipShape(RoundedRectangle(cornerRadius: 14))
+                }
+                .disabled(authManager.isAuthenticating)
+                .padding(.horizontal, 40)
+
+                // Passcode fallback hint
+                if authManager.canUseDevicePasscode {
+                    Text("Or use your device passcode")
+                        .font(.caption)
+                        .foregroundStyle(.tertiary)
+                }
+
+                Spacer()
+                    .frame(height: 60)
+            }
+            .padding()
+        }
+        .alert("Authentication Failed", isPresented: $showError) {
+            Button("Try Again") {
+                Task {
+                    await authManager.authenticate()
+                }
+            }
+            Button("Cancel", role: .cancel) { }
+        } message: {
+            Text("Unable to verify your identity. Please try again.")
+        }
+        .onAppear {
+            // Auto-trigger authentication on appear
+            if !authManager.isUnlocked && !authManager.isAuthenticating {
+                Task {
+                    await authManager.authenticate()
+                }
+            }
+        }
+    }
+}