Fix SSH connection issues and enable no-extension file editing

- Add SSH connection checking with auto-reconnection in FileWindow
- Fix missing sshHost parameter passing from FileManagerModern
- Enable editing for files without extensions (.bashrc, Dockerfile, etc.)
- Add proper error handling for SSH connection failures
- Fix onContentChange callback for real-time text editing

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

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

src/ui/Desktop/Apps/File Manager/FileManagerModern.tsx

@@ -350,6 +350,7 @@ function FileManagerContent({ initialHost, onClose }: FileManagerModernProps) {
           windowId={windowId}
           file={file}
           sshSessionId={sshSessionId}
+          sshHost={currentHost}
           initialX={offsetX}
           initialY={offsetY}
         />