chore(config): set EDITOR/VISUAL defaults and update fish/zsh keybindings

dot_config/fish/functions/fish_user_key_bindings.fish

@@ -2,7 +2,8 @@ function fish_user_key_bindings
     # Keys owned by kitty.conf never reach fish and are NOT bound here:
     #   ctrl-g → lazygit overlay, ctrl-a → omp hsplit, ctrl-y → yazi vsplit,
     #   ctrl-h/j/k/l → vim-aware split nav (pass_keys.py).
-    bind ctrl-e nvim repaint
+    # ctrl-e: yazi, same as ctrl-f (cd's to yazi's exit dir on quit).
+    bind ctrl-e 'yy; commandline -f repaint'
     bind ctrl-b purple repaint
     bind ctrl-y clip-last