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/Views/CustomizeView/SubViews/ThemePickerView.swift

@@ -11,7 +11,8 @@ struct ThemePickerView: View {
     @Environment(\.colorScheme) var colorScheme
 
     @State private var selectedTheme: Theme = UserDefaultsStore.theme()
-    @AppStorage(UserDefaultsStore.Keys.textColor.rawValue, store: GroupUserDefaults.groupDefaults) private var textColor: Color = DefaultTextColor.textColor
+
+    private var textColor: Color { selectedTheme.currentTheme.labelColor }
 
     var body: some View {
         ZStack {
@@ -70,31 +71,8 @@ struct ThemePickerView: View {
             selectedTheme = theme
         }
 
-        changeTextColor(forTheme: theme)
         EventLogger.log(event: "change_theme_id", withData: ["id": theme.rawValue])
     }
-
-    private func changeTextColor(forTheme theme: Theme) {
-        if [Theme.iFeel, Theme.system].contains(theme) {
-            let currentSystemScheme = UITraitCollection.current.userInterfaceStyle
-            switch currentSystemScheme {
-            case .unspecified:
-                textColor = .black
-            case .light:
-                textColor = .black
-            case .dark:
-                textColor = .white
-            @unknown default:
-                textColor = .black
-            }
-        }
-        if theme == Theme.dark {
-            textColor = .white
-        }
-        if theme == Theme.light {
-            textColor = .black
-        }
-    }
 }
 
 struct ThemePickerView_Previews: PreviewProvider {