🎨 Palette: [UX improvement] Fix TUI keyboard traps and improve headless prompt choices

[haseeb-heaven]

💡 What:

• Mapped standard terminal interrupt byte (\x03, Ctrl-C) to trigger the escape action in raw TUI mode, preventing keyboard traps.
• Added explicit visual shortcut hints (| Esc/Ctrl-C to cancel) to the TUI footer.
• Updated the fallback headless Prompt.ask to render explicitly the available input choices inline.

🎯 Why:

• Raw terminal interactions can trap users if they attempt to use familiar exit sequences like Ctrl-C, frustrating their experience. Providing clear exit indications, mappings, and visibly surfaced choices directly aligns with web-based micro-UX principles ported to the CLI.

📸 Before/After:
Before:
Test (a):
After:
Test [a|b] (a):

♿ Accessibility:

• Eliminates keyboard traps for assistive and non-assistive users alike by globally capturing the standard terminal interrupt.
• Exposes choices overtly without requiring them to trigger errors first in headless modes.

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PR created automatically by Jules for task 2390350896898547139 started by @haseeb-heaven

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5f45c945-26e6-43a7-98fd-8d0a0f409720

📥 Commits

Reviewing files that changed from the base of the PR and between 2a47494 and f5547db.

📒 Files selected for processing (2)

• .jules/palette.md
• libs/terminal_ui.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch palette/tui-accessibility-ux-2390350896898547139

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