Add reset context button to Screen Assistant

DynamicIsland/components/ScreenAssistant/ChatPanels.swift

@@ -204,6 +204,24 @@ struct ChatMessagesView: View {
                 
                 Spacer()
 
+                Button(action: {
+                    screenAssistantManager.resetConversationContext()
+                }) {
+                    HStack(spacing: 6) {
+                        Image(systemName: "arrow.counterclockwise")
+                            .font(.caption)
+                        Text("Reset Context")
+                            .font(.caption)
+                    }
+                    .foregroundColor(.secondary)
+                    .padding(.horizontal, 8)
+                    .padding(.vertical, 5)
+                    .background(Color.gray.opacity(0.12))
+                    .cornerRadius(8)
+                }
+                .buttonStyle(PlainButtonStyle())
+                .help("Clear conversation and attachments")
+                
                 Button(action: {
                     screenAssistantManager.closePanels()
                 }) {

DynamicIsland/managers/ScreenAssistantManager.swift

@@ -1103,7 +1103,13 @@ class ScreenAssistantManager: NSObject, ObservableObject {
     }
     
     func clearChat() {
+        resetConversationContext()
+    }
+
+    func resetConversationContext() {
+        isLoading = false
         chatMessages.removeAll()
+        clearAllFiles()
     }
     
     private func addAssistantMessage(_ content: String) {