feat: E edits the config file

E opens your config like e opens a file: in the nvim lazysecrets runs
in, else in $VISUAL or $EDITOR, else in the system's default app. A
missing config is made first, with a link to its docs. Closing the
editor says to restart lazysecrets to use the changes.

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

internal/ui/keys/keys.go

@@ -48,7 +48,7 @@ type Map struct {
 	SplitLeft, SplitRight, SplitReset key.Binding
 	Taller, Shorter, ZoomIn, ZoomOut  key.Binding
 	Login, Refresh, Help, Quit        key.Binding
-	Update                            key.Binding
+	Update, EditConfig                key.Binding
 	// filter
 	AcceptFilter, ClearFilter            key.Binding
 	FilterUp, FilterDown                 key.Binding
@@ -131,6 +131,7 @@ func (m *Map) Actions() []Action {
 		a(Lists, "refresh", &m.Refresh, "refresh", "other", "Reload the focused pane, bypassing the cache."),
 		a(Lists, "login", &m.Login, "sign in", "other", "Sign in again (az login or databricks auth login) when a login has expired."),
 		a(Lists, "update", &m.Update, "update", "other", "Check for a newer lazysecrets: its changelog, and update to it."),
+		a(Lists, "editConfig", &m.EditConfig, "edit config", "other", "Open your config file like e opens a file: in the nvim lazysecrets runs in, else in $VISUAL or $EDITOR, else in the system's default app. Made if it doesn't exist yet. Changes apply when lazysecrets starts again."),
 		a(Lists, "help", &m.Help, "help", "other", "Show this list. Also works in Go to while browsing, and in menus, showing their keys first."),
 		a(Lists, "quit", &m.Quit, "quit", "other", "Quit lazysecrets. ctrl+c always quits too."),
 
@@ -194,7 +195,7 @@ var defaults = map[string][]string{
 	"lists.dividerLeft": {"ctrl+left", "<"}, "lists.dividerRight": {"ctrl+right", ">"},
 	"lists.taller": {"ctrl+down", "}"}, "lists.shorter": {"ctrl+up", "{"},
 	"lists.zoomIn": {"+"}, "lists.zoomOut": {"_"}, "lists.resetLayout": {"="},
-	"lists.refresh": {"r"}, "lists.login": {"L"}, "lists.update": {"U"}, "lists.help": {"?"}, "lists.quit": {"q"},
+	"lists.refresh": {"r"}, "lists.login": {"L"}, "lists.update": {"U"}, "lists.editConfig": {"E"}, "lists.help": {"?"}, "lists.quit": {"q"},
 
 	"filter.down": {"ctrl+j", "ctrl+n", "down"}, "filter.up": {"ctrl+k", "ctrl+p", "up"},
 	"filter.copyValue": {"ctrl+y"}, "filter.reveal": {"ctrl+r"}, "filter.star": {"ctrl+f"},