feat: add hint_window widget type

src/config.zig

@@ -49,6 +49,7 @@ home_style: WidgetStyle = .bars_top_bottom,
 pane_left_style: WidgetStyle = .bar_right,
 pane_right_style: WidgetStyle = .bar_left,
 pane_style: PaneStyle = .panel,
+hint_window_style: WidgetStyle = .thick_boxed,
 
 centered_view: bool = false,
 centered_view_width: usize = 145,
@@ -90,6 +91,7 @@ pub const WidgetType = enum {
     home,
     pane_left,
     pane_right,
+    hint_window,
 };
 
 pub const WidgetStyle = enum {