Update Neon colors and show color circles in theme picker

- Update NeonMoodTint to use synthwave colors matching Neon voting style
  (cyan, lime, yellow, orange, magenta)
- Replace text label with 5 color circles in theme preview Colors row
- Remove unused textColor customization code and picker views
- Add .id(moodTint) to Month/Year views for color refresh
- Clean up various unused color-related code

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

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

Shared/Models/MoodTintable.swift

@@ -7,12 +7,6 @@
 
 import SwiftUI
 
-struct DefaultTextColor {
-    static var textColor: Color {
-        Color(UIColor.label)
-    }
-}
-
 protocol MoodTintable {
     static func color(forMood mood: Mood) -> Color
     static func secondary(forMood mood: Mood) -> Color
@@ -232,37 +226,44 @@ final class AllRedMoodTint: MoodTintable {
 }
 
 final class NeonMoodTint: MoodTintable {
+    // Synthwave color palette matching the Neon voting style
+    private static let neonCyan = Color(red: 0.0, green: 1.0, blue: 0.82)
+    private static let neonLime = Color(red: 0.2, green: 1.0, blue: 0.6)
+    private static let neonYellow = Color(red: 1.0, green: 0.9, blue: 0.0)
+    private static let neonOrange = Color(red: 1.0, green: 0.5, blue: 0.0)
+    private static let neonMagenta = Color(red: 1.0, green: 0.0, blue: 0.8)
+
     static func color(forMood mood: Mood) -> Color {
         switch mood {
         case .horrible:
-            return Color(hex: "#ff1818")
+            return neonMagenta
         case .bad:
-            return Color(hex: "#FF5F1F")
+            return neonOrange
         case .average:
-            return Color(hex: "#1F51FF")
+            return neonYellow
         case .good:
-            return Color(hex: "#FFF01F")
+            return neonLime
         case .great:
-            return Color(hex: "#39FF14")
+            return neonCyan
         case .missing:
             return Color(uiColor: UIColor.systemGray2)
         case .placeholder:
             return Color(uiColor: UIColor.systemGray2)
         }
     }
-    
+
     static func secondary(forMood mood: Mood) -> Color {
         switch mood {
         case .horrible:
-            return Color(hex: "#8b1113")
+            return neonMagenta.opacity(0.6)
         case .bad:
-            return Color(hex: "#893315")
+            return neonOrange.opacity(0.6)
         case .average:
-            return Color(hex: "#0f2a85")
+            return neonYellow.opacity(0.6)
         case .good:
-            return Color(hex: "#807a18")
+            return neonLime.opacity(0.6)
         case .great:
-            return Color(hex: "#218116")
+            return neonCyan.opacity(0.6)
         case .missing:
             return Color(uiColor: UIColor.label)
         case .placeholder:

Shared/Models/Theme.swift

@@ -43,7 +43,7 @@ enum Theme: String, CaseIterable {
     
     var currentTheme: Themeable {
         switch self {
-            
+
         case .system:
             return SystemTheme()
         case .iFeel:
@@ -54,6 +54,17 @@ enum Theme: String, CaseIterable {
             return AlwaysLight()
         }
     }
+
+    var preferredColorScheme: ColorScheme? {
+        switch self {
+        case .system, .iFeel:
+            return nil // Follow system
+        case .dark:
+            return .dark
+        case .light:
+            return .light
+        }
+    }
 }
 
 protocol Themeable {

Shared/Models/UserDefaultsStore.swift

@@ -178,7 +178,6 @@ class UserDefaultsStore {
         case customWidget
         case customMoodTint
         case customMoodTintUpdateNumber
-        case textColor
         case showNSFW
         case shape
         case daysFilter
@@ -200,24 +199,47 @@ class UserDefaultsStore {
         case currentSelectedHeaderViewViewType
     }
     
+    /// Cached onboarding data to avoid repeated JSON decoding
+    private static var cachedOnboardingData: OnboardingData?
+
     static func getOnboarding() -> OnboardingData {
+        // Return cached data if available
+        if let cached = cachedOnboardingData {
+            return cached
+        }
+
+        // Decode and cache
         if let data = GroupUserDefaults.groupDefaults.object(forKey: UserDefaultsStore.Keys.savedOnboardingData.rawValue) as? Data,
            let model = try? JSONDecoder().decode(OnboardingData.self, from: data) {
+            cachedOnboardingData = model
             return model
         } else {
-            return OnboardingData()
+            let defaultData = OnboardingData()
+            cachedOnboardingData = defaultData
+            return defaultData
         }
     }
-    
+
+    /// Invalidate cached onboarding data (call when data might have changed externally)
+    static func invalidateOnboardingCache() {
+        cachedOnboardingData = nil
+    }
+
     @discardableResult
     static func saveOnboarding(onboardingData: OnboardingData) -> OnboardingData {
+        // Invalidate cache before saving
+        cachedOnboardingData = nil
+
         do {
             let data = try JSONEncoder().encode(onboardingData)
             GroupUserDefaults.groupDefaults.set(data, forKey: UserDefaultsStore.Keys.savedOnboardingData.rawValue)
         } catch {
             print("Error saving onboarding: \(error)")
         }
-        return UserDefaultsStore.getOnboarding()
+
+        // Re-cache the saved data
+        cachedOnboardingData = onboardingData
+        return onboardingData
     }
     
     static func moodMoodImagable() -> MoodImagable.Type {