Rename GameStates to States and adjust keybindings

Replace the old `GameStates` struct with a new `states` module, rename
the
field in `App` to `states`, and update construction to pass CLI args.
Remove the now‑unused `game_states.rs` file and adjust imports
accordingly.
Update keybinding definitions: change the wildcard symbol to "[All]" and
simplify the wildcard detection logic by dropping the modifiers check.

src/app/views/main_menu.rs

@@ -65,7 +65,7 @@ pub fn main_menu_view(app: &App, area: Rect, buf: &mut Buffer) {
             .map(|(i, view)| {
                 let view_string: String = format_view_string(format!("{:?}", view));
 
-                let styled: Line<'_> = if app.game_states.main_menu_state.selected_view == i {
+                let styled: Line<'_> = if app.states.main_menu.selected_view == i {
                     Line::from(format!("> {view_string}")).yellow()
                 } else {
                     Line::from(view_string).white()