Add warning log for Playwright server connection failure

Introduce a warning log to notify when failing to connect to the Playwright server, followed by a fallback to launching a local browser.

playwright.go

@@ -173,6 +173,7 @@ func NewPlayWrightBrowser(opts ...PlayWrightBrowserOptions) (Browser, error) {
 			if opt.DontLaunchOnConnectFailure {
 				return nil, err
 			}
+			slog.Warn("failed to connect to playwright server, launching local browser", "err", err)
 			launch = true
 		}
 	}