tui: make Esc clear request_user_input notes while notes are shown

[charley-oai]

Summary

This PR updates the request_user_input TUI overlay so Esc is context-aware:

• When notes are visible for an option question, Esc now clears notes and exits notes mode.
• When notes are not visible (normal option selection UI), Esc still interrupts as before.

It also updates footer guidance text to match behavior.

Changes

• Added a shared notes-clear path for option questions:
  • Tab and Esc now both clear notes and return focus to options when notes are visible.
• Updated footer hint text in notes-visible state:
  • from: tab to clear notes | ... | esc to interrupt
  • to: tab or esc to clear notes | ...
• Hid esc to interrupt hint while notes are visible for option questions.
• Kept esc to interrupt visible and functional in normal option-selection mode.
• Updated tests to assert the new Esc behavior in notes mode.
• Updated snapshot output for the notes-visible footer row.
• Updated docs in docs/tui-request-user-input.md to reflect mode-specific Esc behavior.

[charley-oai]

@codex review this

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Swish!

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