fix: Windows auto-connect profiling (#835) (#840)

* fix: Windows auto-connect profiling (#835)

Fix three interrelated bugs causing `--auto-connect` to fail on Windows,
plus a UX issue where auto-connect hijacked existing tabs:

1. Stale DevToolsActivePort — add TCP port liveness check before returning
   M144+ WebSocket URL; remove stale files when port is dead.

2. Missing Windows error codes — add os error 10061 (WSAECONNREFUSED) and
   10054 (WSAECONNRESET) to is_transient_error() so daemon startup races
   are retried on Windows.

3. --auto-connect not propagated to daemon — add auto_connect to
   DaemonOptions, set AGENT_BROWSER_AUTO_CONNECT env var via
   apply_daemon_env(), and guard the headed launch block so it doesn't
   send a second launch that overrides the auto-connect.

4. Auto-connect opens a fresh tab — after connecting to an existing
   Chrome, create a new about:blank tab and bring it to front so
   navigations don't hijack the user's existing tabs.

Made-with: Cursor

* fix: address review feedback — cargo fmt, shared helper, Windows tests

- Run cargo fmt on is_port_reachable() formatting
- Extract duplicated auto-connect-with-fresh-tab logic into
  connect_auto_with_fresh_tab() helper used by both handle_launch()
  and auto_launch()
- Add unit tests for Windows WSAECONNREFUSED (os error 10061) and
  WSAECONNRESET (os error 10054) in is_transient_error()

---------

Co-authored-by: ctate <366502+ctate@users.noreply.github.com>

cli/src/connection.rs

@@ -234,6 +234,7 @@ pub struct DaemonOptions<'a> {
     pub action_policy: Option<&'a str>,
     pub confirm_actions: Option<&'a str>,
     pub engine: Option<&'a str>,
+    pub auto_connect: bool,
     pub idle_timeout: Option<&'a str>,
     pub cdp: Option<&'a str>,
 }
@@ -302,6 +303,9 @@ fn apply_daemon_env(cmd: &mut Command, session: &str, opts: &DaemonOptions) {
     if let Some(engine) = opts.engine {
         cmd.env("AGENT_BROWSER_ENGINE", engine);
     }
+    if opts.auto_connect {
+        cmd.env("AGENT_BROWSER_AUTO_CONNECT", "1");
+    }
     if let Some(idle) = opts.idle_timeout {
         cmd.env("AGENT_BROWSER_IDLE_TIMEOUT_MS", idle);
     }
@@ -533,6 +537,8 @@ fn is_transient_error(error: &str) -> bool {
         || error.contains("os error 2") // No such file or directory (socket gone)
         || error.contains("os error 61") // Connection refused (macOS)
         || error.contains("os error 111") // Connection refused (Linux)
+        || error.contains("os error 10061") // Connection refused (Windows)
+        || error.contains("os error 10054") // Connection reset by peer (Windows)
 }
 
 fn send_command_once(cmd: &Value, session: &str) -> Result<Response, String> {
@@ -708,6 +714,20 @@ mod tests {
         ));
     }
 
+    #[test]
+    fn test_is_transient_error_connection_refused_windows() {
+        assert!(is_transient_error(
+            "Failed to connect: No connection could be made because the target machine actively refused it. (os error 10061)"
+        ));
+    }
+
+    #[test]
+    fn test_is_transient_error_connection_reset_windows() {
+        assert!(is_transient_error(
+            "Failed to send: An existing connection was forcibly closed by the remote host. (os error 10054)"
+        ));
+    }
+
     #[test]
     fn test_is_transient_error_non_transient() {
         // These should NOT be considered transient