panesync start + panesync end = panesync toggle

README.md

@@ -170,10 +170,9 @@ next_tab = "ALT+SHIFT+L"
 open_font_selector = "ALT+T"
 open_scrollback = "ALT+S"
 create_worktree = "ALT+W"
-pane_sync_start = "ALT+Y"
+pane_sync_toggle = "ALT+Y"
 pane_sync_select = "SPACE"
 pane_sync_commit = "ALT+SHIFT+Y"
-pane_sync_end = "ALT+U"
 paste = "CTRL+SHIFT+V"
 ```
 
@@ -192,11 +191,10 @@ paste = "CTRL+SHIFT+V"
 - `Alt+s`: open the active pane scrollback in `$EDITOR`
 - `Alt+w`: edit a worktree name, then run `git worktree add <relative_worktree_path>/<name>`
   from the previously focused pane's working directory
-- `Alt+y`: enter pane-sync selection mode
+- `Alt+y`: enter pane-sync selection mode, cancel selection mode, or stop an active pane sync
 - `Space`: toggle the focused pane in the sync set while pane-sync selection mode is active
 - `Alt+Shift+y`: commit the current pane-sync selection; input typed or pasted into any synced
   pane is mirrored to the other synced panes
-- `Alt+u`: end pane sync
 - `Ctrl+Shift+v`: paste
 - Font default: `JetBrainsMono Nerd Font`
 - Kitty graphics protocol parsing is enabled by default