Drop crossterm delete App add CLI defaults

Remove the crossterm dependency and its input handling, delete the
now‑unused
App module, and provide default values for all command‑line options.

src/app/app.rs

@@ -0,0 +1,74 @@
+use ratatui::{
+    DefaultTerminal, Frame,
+    crossterm::event::{self, KeyCode, KeyEvent, KeyEventKind},
+};
+use std::{
+    io::Result,
+    sync::mpsc::{self, Receiver},
+};
+
+pub struct App {
+    pub exit: bool,
+    pub default_window: String,
+    pub username: String,
+    pub game_mode: String,
+    pub map_width: u8,
+    pub map_height: u8,
+    pub perk_deck: String,
+    pub starting_wood: u8,
+    pub starting_iron: u8,
+    pub supply_limit: u8,
+    pub xp_modifier: f32,
+    pub skill_points_limit: u16,
+}
+
+pub enum Event {
+    Input(KeyEvent),
+}
+
+impl App {
+    pub fn run(&mut self, terminal: &mut DefaultTerminal, rx: Receiver<Event>) -> Result<()> {
+        while !self.exit {
+            terminal.draw(|frame: &mut Frame<'_>| self.draw(frame))?;
+
+            let event: Event = match rx.recv() {
+                Ok(ev) => ev,
+                Err(_) => break,
+            };
+            match event {
+                Event::Input(key_event) => self.handle_key_event(key_event)?,
+            }
+        }
+
+        Ok(())
+    }
+
+    fn draw(&self, frame: &mut Frame<'_>) {
+        frame.render_widget(self, frame.area());
+    }
+
+    fn handle_key_event(&mut self, key_event: KeyEvent) -> Result<()> {
+        if key_event.kind == KeyEventKind::Press && key_event.code == KeyCode::Char('q') {
+            self.exit = true;
+        }
+
+        Ok(())
+    }
+}
+
+pub fn handle_input_events(tx: mpsc::Sender<Event>) {
+    loop {
+        match event::read() {
+            Ok(ev) => {
+                if let event::Event::Key(key_event) = ev {
+                    if tx.send(Event::Input(key_event)).is_err() {
+                        break;
+                    }
+                }
+            }
+            Err(_) => {
+                continue;
+            }
+        }
+    }
+}