Flutter-এ নেভিগেশন কীভাবে কাজ করে?

// the Navigator manages a STACK of routes (screens)
// PUSH a new screen onto the stack (navigate to it)
Navigator.push(
  context,
  MaterialPageRoute(builder: (context) => SecondScreen()),
);

// POP — go back (remove the top screen, return to the previous)
Navigator.pop(context);

Think of navigation as a STACK of screens:
  → PUSH adds a screen on top (navigate forward)
  → POP removes the top screen (go back)
  → the back button / gesture also pops