🎨 Palette: [UX improvement] Fix terminal trap and clarify exit

[haseeb-heaven]

• 💡 What: Added explicitly handled Ctrl-C (\x03) to the raw mode input handling in libs/terminal_ui.py, and updated the UI footer to clarify exit shortcuts ('Esc/Ctrl-C to cancel').
• 🎯 Why: To prevent keyboard traps in terminal UI selectors when the UI is run in raw mode, making the interface more intuitive and accessible.
• 📸 Before/After: Before, Ctrl-C did nothing and trapped users in loops; now it exits smoothly and users are explicitly guided on how to cancel operations via the footer hint.
• ♿ Accessibility: Improved keyboard interaction handling and provided clear on-screen instructions, meeting micro-UX standards for CLI applications.

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PR created automatically by Jules for task 12632160694626045294 started by @haseeb-heaven

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 74208a73-b8d1-4289-90e8-b5b55833e9e3

📥 Commits

Reviewing files that changed from the base of the PR and between 2a47494 and bc47654.

📒 Files selected for processing (3)

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

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch palette-fix-terminal-trap-12632160694626045294

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