add Cmd+Up/Down keyboard shortcuts to jump to start/end of prompt text

[itsjling]

Users can now press Cmd+Up to jump to the beginning of their prompt and Cmd+Down to jump to the end, matching standard text editing behavior in most macOS applications.

What does this PR do?

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[github-actions]

Hey! Your PR title add Cmd+Up/Down keyboard shortcuts to jump to start/end of prompt text doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

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[itsjling]

sorry trying to open pr on my fork

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicate/Related PRs Found:

1. feat(tui): vim motions in prompt input (PR feat(tui): vim motions in prompt input #12679)

   • feat(tui): vim motions in prompt input #12679
   • Related: Adds keyboard navigation features to the prompt input, likely overlapping with cursor jumping functionality.

2. Fix ctrl+p/ctrl+n navigation in multi-line TUI prompts (PR Fix ctrl+p/ctrl+n navigation in multi-line TUI prompts #5473)

   • Fix ctrl+p/ctrl+n navigation in multi-line TUI prompts #5473
   • Related: Addresses keyboard navigation in prompt input, suggesting active development in this area.

3. feat(tui): add inline Ctrl+R reverse-i-search for prompt history (PR feat(tui): add inline Ctrl+R reverse-i-search for prompt history #6276)

   • feat(tui): add inline Ctrl+R reverse-i-search for prompt history #6276
   • Related: Adds keyboard shortcuts for prompt interaction.

4. feat(tui): add configurable readline-style text transformations (PR feat(tui): add configurable readline-style text transformations #6778)

   • feat(tui): add configurable readline-style text transformations #6778
   • Related: Implements readline-style text editing features, which may include cursor movement shortcuts.

5. fix(tui): resolve keybind conflicts and missing defaults (PR fix(tui): resolve keybind conflicts and missing defaults (issue #4997) #8786)

   • fix(tui): resolve keybind conflicts and missing defaults (issue #4997) #8786
   • Related: Addresses keyboard binding conflicts, relevant for new shortcut additions.

Most relevant: PR #12679 (vim motions in prompt input) is the most recent and likely the closest in functionality—it's adding keyboard navigation to the same prompt input area.