🎨 Palette: Add explicit choice indicators to TUI headless prompts

[haseeb-heaven]

💡 What: Manually formatting choice options (e.g., [code|chat]) directly into the prompt string for rich.prompt.Prompt.ask when sys.stdin.isatty() is False.
🎯 Why: The previous prompt provided no clues to the user regarding the available options in non-interactive or testing environments. We avoid the choices kwarg to preserve existing custom case-insensitivity logic.
📸 Before/After: Before: Mode: | After: Mode \[code|chat\]:
♿ Accessibility: Improves clarity for headless and automated execution paths by explicitly stating acceptable inputs.

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PR created automatically by Jules for task 993448652329842756 started by @haseeb-heaven

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a51d7bf9-d648-4c6a-9240-e37c4c4a97de

📥 Commits

Reviewing files that changed from the base of the PR and between 2a47494 and ca553c0.

📒 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-options-993448652329842756

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