fix(opencode): keep TUI interactive with piped stdin

[LordMikkel]

Issue for this PR

Closes #28538

Related to #387, #24195 and #3930.
The root cause was never addressed. This PR includes an actual fix.

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

When stdin is piped, the TUI renderer was reading input from the pipe
instead of the terminal, which broke keyboard control completely,
ANSI noise, no interaction.

The run command already handled this with resolveInteractiveStdin(),
but tui was missing it. This PR applies the same fix: pass the
controlling TTY (/dev/tty on Linux, CONIN$ on Windows) to the renderer
while still consuming the piped content as the prompt.

How did you verify your code works?

• opencode < test-prompt.txt
• echo "hello" | opencode
• opencode --prompt "hello"
• opencode run < test-prompt.txt

Screenshots / recordings

with the PR:

without the PR (looh the issue):

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[LordMikkel]

Updated this against the latest dev, so it should be mergeable again.

I re-tested the stdin locally, including piped stdin and --prompt, and also ran typecheck plus the existing runtime.stdin tests.

[github-actions]

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[LordMikkel]

Hi staff team! @simonklee @thdxr @kommander @rekram1-node

Could you please reopen this PR? 🙏

It was closed automatically by the bot due to age, but it fixes a real and reproducible bug that was previously reported that you wanted to be fixed since the last year: #28538, where the TUI loses interactivity and prints ANSI noise when stdin is piped. This also matches the older related reports #24195, #3871, and #6220.

The fix is small and follows the same approach already used by the run command: passing the controlling TTY (/dev/tty or CONIN$) to the renderer.

I recently updated it against the latest dev branch and re-tested it locally, so there are no conflicts.

It can be validated with a simple:

echo "hello" | opencode

I’d be very happy to contribute this fix to the project. Thanks for your time!