feat(tui): make status and help dialogs scrollable

[mynameistito]

Summary

• Added scrollbox to DialogStatus and DialogHelp components.
• Implemented keyboard scrolling handlers (Up/Down, PageUp/PageDown, Home/End).
• Ensured headers remain fixed while content scrolls.
• Fixed an issue where long status lists were truncated on small terminals.

Closes #$(gh issue list --limit 1 --json number --jq '.[0].number')

Fixes: https://github.com/anomalyco/opencode/issues/9314

https://github.com/user-attachments/assets/ec84268f-8254-48f9-9809-1f43fcae0dee

[github-actions[bot]]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

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[github-actions[bot]]

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No duplicate PRs found

[mynameistito]

Not ready for merge yet ☺️ adding a couple more fixes

[mynameistito]

Okay sweet ready for a review!

https://github.com/user-attachments/assets/46ac4bfd-06c6-4cc8-bd5b-fdf6b941a64f