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/main.rs

@@ -316,6 +316,7 @@ fn main() {
         action_policy: flags.action_policy.as_deref(),
         confirm_actions: flags.confirm_actions.as_deref(),
         engine: flags.engine.as_deref(),
+        auto_connect: flags.auto_connect,
         idle_timeout: flags.idle_timeout.as_deref(),
         cdp: flags.cdp.as_deref(),
     };
@@ -617,6 +618,7 @@ fn main() {
         || !flags.extensions.is_empty())
         && flags.cdp.is_none()
         && flags.provider.is_none()
+        && !flags.auto_connect
     {
         let mut launch_cmd = json!({
             "id": gen_id(),