🎨 Palette: Improve terminal UX accessibility with visible prompts and explicit cancel hints

[haseeb-heaven]

💡 What: Added explicit keyboard cancel hints (Ctrl-C to cancel), gracefully handled \x03 keystrokes to prevent keyboard traps, and surfaced available choices explicitly in headless inputs.
🎯 Why: To prevent terminal hangs from missing Esc ANSI sequences, give users explicit visual affordances for prompts, and provide a clear, reliable path to exit.
📸 Before/After: Before, non-interactive prompts didn't list options, and Esc caused hangs. After, choices are explicitly visible [code|chat|...] and Ctrl-C is properly handled.
♿ Accessibility: Improved terminal-equivalent accessibility by surfacing explicit keyboard shortcuts, avoiding keyboard traps, and clearly displaying available input choices.

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PR created automatically by Jules for task 3787583290221606918 started by @haseeb-heaven

Summary by CodeRabbit

• New Features

  • Improved terminal prompts to show available options more clearly in non-interactive environments.
  • Added visible shortcut guidance to selector footers, including a cancel hint.

• Bug Fixes

  • Ctrl-C now cancels immediately and consistently in terminal input on both Windows and POSIX systems.
  • Clarified prompt behavior for raw terminal mode so cancel actions are shown correctly.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4ccd92cb-4bb1-476e-90ef-b7efa5825898

📥 Commits

Reviewing files that changed from the base of the PR and between 2a47494 and 57c5c78.

📒 Files selected for processing (2)

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

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📝 Walkthrough

Walkthrough

Adds Ctrl-C detection to the terminal UI's key-reading logic on Windows and POSIX, raising KeyboardInterrupt when detected. Updates the selector footer to always show a cancel hint and modifies the non-TTY prompt to list available options. Adds a documentation note in the palette file.

Changes

Terminal UI Ctrl-C Handling

Layer / File(s)	Summary
Ctrl-C detection in key reading libs/terminal_ui.py	_read_key now checks for '\x03' on both Windows and POSIX input paths and raises KeyboardInterrupt immediately.
Selector footer and prompt text updates libs/terminal_ui.py	_render_selector footer always appends "(Ctrl-C to cancel)"; non-TTY _select_option prompt now lists pipe-delimited options in the Prompt.ask text.
Palette documentation entry .jules/palette.md	Adds a dated section documenting TUI shortcut conventions, headless rich prompt handling, and correct cancellation key usage.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Sequence Diagram(s)

sequenceDiagram
  participant User
  participant TerminalUI
  participant OS as "OS Input (msvcrt/stdin)"

  User->>TerminalUI: Trigger key read (_read_key)
  TerminalUI->>OS: Read single key
  OS-->>TerminalUI: Return key
  alt Key is Ctrl-C ('\x03')
    TerminalUI-->>User: Raise KeyboardInterrupt
  else Other key
    TerminalUI-->>User: Return key normally
  end

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🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main UX accessibility changes to terminal prompts and cancel hints.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch palette/tui-cancel-hints-3787583290221606918

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