feat: e on the status pane edits the config (#55)

`e` on the status pane (`0`) opens your config file, as in lazygit's status panel. The status footer shows it as `e edit config`. There's no global key. It opens the config the same way `e` opens a local file:
- inside nvim, in that nvim (lazysecrets quits);
- otherwise in `$VISUAL` or `$EDITOR`, coming back after;
- otherwise in the system's default app.

It opens the first config file: your own, also when `--config` layers several. A config that doesn't exist yet is created with a comment linking to its docs. Closing the editor says "restart lazysecrets to use it", since the config is read at startup.

Docs: keys.md (status pane) and config.md. Tested: the default app with a new config, nvim with an existing one left unchanged, the restart message, and the footer.

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Reviewed-on: #55
Co-authored-by: Karl-Einar Bergstrøm <karl-einarb@outlook.com>

internal/ui/keys/keys.go

@@ -114,7 +114,7 @@ func (m *Map) Actions() []Action {
 		a(Lists, "copyReference", &m.CopyRef, "copy reference", "secrets", "Copy the reference to use in config, e.g. @Microsoft.KeyVault(SecretUri=…) or {{secrets/scope/key}}."),
 		a(Lists, "versions", &m.Versions, "versions", "secrets", "List the versions of the selected item (Azure). Reveal, copy and share then act on the selected version."),
 		a(Lists, "openInBrowser", &m.Open, "open in browser", "secrets", "Open the selected subscription, vault or item in the browser (Azure portal or Databricks workspace)."),
-		a(Lists, "edit", &m.Edit, "open file", "secrets", "Open the selected SOPS or .env file, or the file of the selected secret at its line. SOPS files open with sops edit. Others open in the nvim lazysecrets runs in (quitting lazysecrets), else in $VISUAL or $EDITOR, else in the system's default app."),
+		a(Lists, "edit", &m.Edit, "open file", "secrets", "Open the selected SOPS or .env file, or the file of the selected secret at its line; on the status pane, your config (made if it isn't there yet). SOPS files open with sops edit. Others open in the nvim lazysecrets runs in (quitting lazysecrets), else in $VISUAL or $EDITOR, else in the system's default app."),
 
 		a(Lists, "share", &m.Share, "copy link", "share", "Copy a lazysecrets:// link to the selected subscription, workspace, vault, scope or secret, for sharing. From the versions view the link is pinned to that version."),
 		a(Lists, "shareMenu", &m.ShareMenu, "share", "share", "Choose what to share: the lazysecrets link, the plain Key Vault URL, the config reference, or the web page."),