add doc for vertical tab bar

Author: sawka

docs/docs/config.mdx

@@ -44,6 +44,7 @@ wsh editconfig
 | app:disablectrlshiftarrows <VersionBadge version="v0.14" />          | bool     | Set to true to disable Ctrl+Shift block-navigation keybindings (`Arrow` and `h/j/k/l`) (defaults to false)                                                                                                                                                    |
 | app:disablectrlshiftdisplay <VersionBadge version="v0.14" />         | bool     | Set to true to disable the Ctrl+Shift visual indicator display (defaults to false)                                                                                                                                                                            |
 | app:focusfollowscursor <VersionBadge version="v0.14" />              | string   | Controls whether block focus follows cursor movement: `"off"` (default), `"on"` (all blocks), or `"term"` (terminal blocks only)                                                                                                                             |
+| app:tabbar <VersionBadge version="v0.14.4" />                        | string   | Controls the position of the tab bar: `"top"` (default) for a horizontal tab bar at the top of the window, or `"left"` for a vertical tab bar on the left side of the window                                                                                |
 | ai:preset                            | string   | the default AI preset to use                                                                                                                                                                                                                                  |
 | ai:baseurl                           | string   | Set the AI Base Url (must be OpenAI compatible)                                                                                                                                                                                                               |
 | ai:apitoken                          | string   | your AI api token                                                                                                                                                                                                                                             |