[Documentation] Multiple keyboard shortcuts missing from /help and ? menu

Description

Several useful keyboard shortcuts are not documented in the in-app help (? menu and /help command). Users have to discover these through the incidental hint texts, or through the online documentation.

Shortcuts missing from help

| Shortcut | Function |
|----------|----------|
| Ctrl+G | Open current prompt in external editor (see #10193) |
| Ctrl+O | Toggle transcript view (shows full conversation with tool details) |
| Ctrl+R | Reverse search through prompt history |
| Ctrl+B | Move Bash command to background |
| Tab | Toggle thinking/extended thinking mode |
| Shift+Tab (twice) | Activate Plan Mode |
| Esc (twice) | Jump back to previous messages |

Expected behavior

All functional keyboard shortcuts should be listed in:

1. The ? menu shown in interactive mode
2. The /help command output

Related issues

• #10193 - Specifically about documenting Ctrl+G

Environment Info

• Platform: linux
• Version: 1.0.39