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

dot_config/fish/conf.d/10-env.fish

@@ -18,6 +18,8 @@ set -gx CODE_ROOT $HOME/Developer
 # Git hosts (non-secret; tokens are in secrets.fish)
 set -gx GITEA_LOGIN code.sonr.org
 set -gx GITLAB_HOST git.sonr.org
+set -gx EDITOR nvim
+set -gx VISUAL nvim
 
 test -x /usr/bin/brave-origin-nightly; and set -gx BROWSER /usr/bin/brave-origin-nightly
 test -x /usr/bin/chromium; and set -gx CHROME_EXECUTABLE /usr/bin/chromium

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