feat(config): add termium PATH export, job bind shortcut, and border animation

dot_config/fish/functions/fish_user_key_bindings.fish

@@ -24,6 +24,9 @@ function fish_user_key_bindings
         bind -M $mode ctrl-p _pj_bind
         bind -M $mode ctrl-a 'omp-session; commandline -f repaint'
         bind -M $mode ctrl-w 'atuin ai inline; commandline -f repaint'
+        # ctrl-z at the prompt: fg the only background job, or pick one from
+        # the jobs tv cable when there are several (_jobs_bind).
+        bind -M $mode ctrl-z _jobs_bind
 
         # Arrow keys: atuin owns up (bound from config.fish, survives the
         # fish_vi_key_bindings reset above because that only erases presets),