feat: a status pane, like lazygit's: version, updates, accounts, files and links

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

docs/keys.md

@@ -112,6 +112,12 @@ that; there `j`/`k`, `/` and `y` work on its rows, and `shift+tab` goes
 back. A value you reveal stays in view whichever pane you're in, until
 it's hidden.
 
+On top, the status pane (`0`) shows the version, a newer release and how
+your accounts are doing. Focused, the right pane lists more: the version
+and updates (`U`), each account (`L` on one that needs it signs in), the
+config, state and cache files (`e` opens one in your editor), and links
+to the docs, source and issues (`o` opens one). `y` copies any of them.
+
 | Key | Action |
 |---|---|
 | `ctrl+←`/`ctrl+→` or `<`/`>` | move the divider between the left panes and the detail pane |