🎨 Palette: Add Esc/Ctrl-C shortcut hints to TUI

[haseeb-heaven]

💡 What: Added explicit handling of Ctrl-C (\x03) in raw terminal input mode and added visible keyboard shortcut hints (Esc/Ctrl-C to cancel) to the TUI selector footer.

🎯 Why: Improves keyboard accessibility by preventing users from feeling stuck in the TUI selector and makes cancellation shortcuts discoverable without guessing.

📸 Before/After: Visual hints added to selector footer.

♿ Accessibility: Enhances discoverability of navigation and exit paths and explicitly handles standard keyboard interrupts in raw TTY mode.

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PR created automatically by Jules for task 8516295852781396463 started by @haseeb-heaven

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e7cf0aec-67ad-4fbb-b52b-889a9e188c2e

📥 Commits

Reviewing files that changed from the base of the PR and between 2a47494 and ef597fa.

📒 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/tui-shortcut-hints-8516295852781396463

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