feat: Resolving concurrency warnings

Sources/FlaggedViews/FlaggedMessageView.swift

@@ -27,6 +27,8 @@ extension FlaggedMessageView {
   }
 }
 
+@MainActor
+@preconcurrency
 public protocol FlaggedMessageViewStyle {
   associatedtype Body: View
   typealias Configuration = FlaggedMessageViewStyleConfiguration
@@ -117,8 +119,10 @@ extension FlaggedMessageViewStyle where Self == AutomaticFlaggedMessageViewStyle
   }
 }
 
-private struct FlaggedMessageViewStyleKey: EnvironmentKey {
-  static var defaultValue = AnyFlaggedMessageViewStyle(
+@MainActor
+private struct FlaggedMessageViewStyleKey: @preconcurrency EnvironmentKey {
+
+  static let defaultValue = AnyFlaggedMessageViewStyle(
     AutomaticFlaggedMessageViewStyle(horizontalSizeClass: nil)
   )
 }