confirm command is ignoring its --timeout option

[dpritchett]

Describe the bug

gum confirm --timeout never times out despite having a documented --timeout option.

Relevant excerpts from gum confirm --help

Usage: gum confirm [<prompt>] [flags]

Ask a user to confirm an action

Arguments:
  [<prompt>]    Prompt to display.

Flags:
     --default              Default confirmation action
     --timeout=0            Timeout until confirm returns selected value or default if provided ($GUM_CONFIRM_TIMEOUT)

To Reproduce
Steps to reproduce the behavior:

This never times out:

❯ gum confirm --timeout=1s && echo "timed out"

Repro but it's a .tape file:

Set TypingSpeed 0.1
Output broken-main.gif
Set Shell zsh
Sleep 500ms
Type "git checkout main && git fetch upstream main && git rev-parse HEAD"
Enter
Type "date +%H:%M:%S.%1N && go run . confirm --timeout=1s --default='Yes' && echo 'Success'"
Enter
Sleep 4s
Ctrl+C
Type "date +%H:%M:%S.%1N"
Enter
Sleep 4s
Ctrl+D

Expected behavior
Confirm times out after the specified duration as described in the docs.

❯ ./gum confirm --timeout=1s && echo "timed out"
┃  Are you sure?
┃
┃     Yes        No

timed out

Screenshots

Before

Gum timeout wrapped in an external timeout command. See that it does not stop at 1 second but stops at 5 per the wrapping command:

After (using fix from #697)

Same call as before but gum times out at 1 second as expected:

Desktop (please complete the following information):

• OS: MacOS
• Browser: uhh.. alacritty is my terminal emulator, fish my shell
• Version: MacOS 15.0.1 (24A348)

Additional context

I have a unit tested fix up in #697.