Refactor keybindings and add validated CLI arguments

Extracted common quit/esc handling into `common_keybindings`. Introduced
`Group::CtrlMovement` for Ctrl‑arrow keys and updated keybinding
definitions.
Removed duplicated quit logic in main_menu and skirmish modules. Bumped
clap to 4.6.0 and updated Cargo.lock. Added range‑checked parsers for
map
size, resources, supply limit, XP modifier and skill points in the CLI.

src/app/keybindings/skirmish.rs

@@ -1,19 +1,17 @@
 use crate::app::{
-    App, View,
-    keybindings::{Action, event_to_action},
+    App,
+    keybindings::{Action, common_keybindings, event_to_action},
 };
 use ratatui::crossterm::event::KeyEvent;
 
 pub fn skirmish_keybindings(app: &mut App, key_event: &KeyEvent) {
     if let Some(action) = event_to_action(&key_event) {
+        common_keybindings(app, action);
         match action {
             Action::ScrollUp => app.states.skirmish.vertical_offset.prev(),
             Action::ScrollDown => app.states.skirmish.vertical_offset.next(),
             Action::ScrollLeft => app.states.skirmish.horizontal_offset.prev(),
             Action::ScrollRight => app.states.skirmish.horizontal_offset.next(),
-            Action::Quit => app.exit = true,
-            Action::Quit2 => app.exit = true,
-            Action::Esc => app.view = View::MainMenu,
             _ => (),
         }
     }