iCloud Backup, better chatview exp. bugfixes++

oAI/Models/Message.swift

@@ -31,6 +31,14 @@ enum MessageRole: String, Codable {
     case system
 }
 
+/// Detail for a single tool call within a system "🔧 Calling:" message.
+/// Not persisted — in-memory only.
+struct ToolCallDetail {
+    let name: String
+    let input: String       // raw JSON string of arguments
+    var result: String?     // raw JSON string of result (nil while pending)
+}
+
 struct Message: Identifiable, Codable, Equatable {
     let id: UUID
     let role: MessageRole
@@ -52,6 +60,9 @@ struct Message: Identifiable, Codable, Equatable {
     // Generated images from image-output models (base64-decoded PNG/JPEG data)
     var generatedImages: [Data]? = nil
 
+    // Tool call details (not persisted — in-memory only for expandable display)
+    var toolCalls: [ToolCallDetail]? = nil
+
     init(
         id: UUID = UUID(),
         role: MessageRole,