feat: e on the status pane edits the config, as in lazygit

Instead of a global E: e on the status pane opens the config, shown
in its footer as "e edit config".

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/config.md

@@ -2,9 +2,9 @@
 
 Optional, at `~/.config/lazysecrets/config.yaml` (or
 `$XDG_CONFIG_HOME/lazysecrets/config.yaml`, or `--config`). Flags override
-it. Unknown keys are an error, so typos don't go unnoticed. `E` in
-lazysecrets opens it in your editor (making it if it isn't there yet);
-changes apply when lazysecrets starts again.
+it. Unknown keys are an error, so typos don't go unnoticed. `e` on the
+status pane (`0`) opens it in your editor, as in lazygit (making it if
+it isn't there yet); changes apply when lazysecrets starts again.
 
 ```yaml
 icons: true            # Nerd Font icons (v3+); also --icons=false or LAZYSECRETS_ICONS=0