feat(config): add kitty tab bar with git info and split-launch shortcut

dot_config/kitty/kitty.conf

@@ -49,7 +49,11 @@ map ctrl+shift+k next_tab
 # Shortcuts
 map ctrl+shift+g launch_ov lazygit
 map ctrl+shift+f launch_tb yazi
-map ctrl+shift+e launch_tb nvim
+# nvim in the current dir, left of the active pane, 50/50. kitty can only add a
+# split *after* the active window, so `layout_action rotate 180` swaps the two
+# halves of the pair the launch just created — nvim ends up on the left and keeps
+# focus. Mirrors ctrl+shift+e in the herdr host (position = "left" there).
+map ctrl+shift+e combine : launch_vs50 nvim : layout_action rotate 180
 # herdr host: a *separate* kitty process, own config (launch cannot take --config)
 # tmux host: same trick — kitty stays dumb, tmux owns panes/windows/sessions
 map ctrl+shift+p launch_hs atuin-pick
@@ -89,8 +93,10 @@ tab_powerline_style angled
 tab_bar_align left
 tab_bar_edge top
 
-tab_title_template " {index}"
-active_tab_title_template " {title}"
+# Titles come from ~/.config/kitty/tab_bar.py (`{custom}`): tab index, cwd, git
+# branch and per-tab change counts. Active tabs use the same text; the powerline
+# colors already say which tab is focused.
+tab_title_template "{custom}"