fix(tui): handle Home and End keys in prompt input

[lichuang]

Issue for this PR

Closes #27661

Type of change

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

What does this PR do?

The Home and End keys did not navigate to the start/end of text in the prompt textarea. Add explicit handling in onKeyDown to move the cursor to buffer start (Home) and buffer end (End).

How did you verify your code works?

Verified by running bun dev and pressing Home/End in the prompt input — cursor now jumps to the beginning and end of the text as expected.

Screenshots / recordings

If this is a UI change, please include a screenshot or recording.

Checklist

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

If you do not follow this template your PR will be automatically rejected.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicate Found

PR #19135: fix(opencode): restore Home/End prompt navigation in TUI
#19135

This PR appears to be directly related—it specifically addresses Home/End key navigation in the TUI prompt, which is the same functionality being fixed in the current PR #31489. This could indicate:

• The fix was previously implemented but regressed
• The earlier fix needs to be revisited or completed
• There may be related context in that PR's discussion about how Home/End navigation should work

You should check PR #19135 to understand the prior implementation and why the issue (#27661) may have reappeared.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[kouhe3]

You have hardcoded the HOME and END keys, which overcorrected the PR bound as a modification keybinds. To change keybind edit tui.json

[github-actions]

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