Adds the following conventional readline-like keybindings:
- `Ctrl+H`: Delete the previous character.
- `Ctrl+D`: Delete the next character.
Additionally, remaps the Debug Console command from Ctrl+D to Ctrl+O, which had been first introduced in PR #486.
- The text buffer now correctly interprets `\\\r` (produced by Shift+Enter in the VSCode terminal) as a newline character.
- Added a corresponding test case to `text-buffer.test.ts`.
Fixes https://buganizer.corp.google.com/issues/418505364
This change adds keybinding support for:
- `Ctrl+B`: Moves the cursor backward one character.
- `Ctrl+F`: Moves the cursor forward one character.
- `Alt+Left Arrow`: Moves the cursor backward one word.
- `Alt+Right Arrow`: Moves the cursor forward one word.
Closes b/411469305.
New keybindings in the main input prompt (when auto-suggestions are not active):
- `Ctrl+L`: Clears the entire screen.
- `Ctrl+A`: Moves the cursor to the beginning of the current input line.
- `Ctrl+E`: Moves the cursor to the end of the current input line.
- `Ctrl+P`: Navigates to the previous command in the input history.
- `Ctrl+N`: Navigates to the next command in the input history.
In the multiline text editor (e.g., when editing a previous message):
- `Ctrl+K`: Deletes text from the current cursor position to the end of the line ("kill line right").
- I plan to utilize these radio buttons for theme selection in the future. Refactoring them into their own component.
Part of https://b.corp.google.com/issues/412797985
