fix: Atuin hangs when attempting to spawn daemon from Ctrl+R invocation (#3502)

This PR fixes a shell hang when daemon autostart happens from the
interactive search widget.

The bash/zsh/fish integrations run `atuin search -i` under command
substitution and swap stdout/stderr so the TUI can draw to the terminal
while the selected command is captured:

```sh
3>&1 1>&2 2>&3
```

This leaves fd 3 open in the atuin search process. If search autostarts
the daemon, the spawned long-running `atuin daemon start --daemonize`
inherits fd 3, the command-substitution pipe, so the shell keeps waiting
for EOF until the daemon is killed.

The fix: close fd 3 after the swap in the non-tmux bash/zsh/fish paths:

```sh
3>&1 1>&2 2>&3 3>&-
```

Tested on zsh; I still need to confirm for bash and fish. Near as I can
tell, the other shell integrations don't need this change.

Fixes #3499

0 files changed, 0 insertions, 0 deletions