refactor: standardize button sizes to 'md' and update header title font weight to '700'.

src/navigation/AppNavigator.tsx

@@ -24,7 +24,7 @@ export default function AppNavigator() {
         screenOptions={{
           headerStyle: { backgroundColor: '#6366f1' },
           headerTintColor: '#fff',
-          headerTitleStyle: { fontWeight: 'bold' },
+          headerTitleStyle: { fontWeight: '700' },
         }}
       >
         {!user ? (

src/pages/AuthLogin.tsx

@@ -80,7 +80,7 @@ export default function AuthLogin() {
         />
 
         {/* Botão de ação que dispara a função handleSubmit para processar as credenciais */}
-        <Button onPress={handleSubmit} style={styles.submitButton} size="lg">
+        <Button onPress={handleSubmit} style={styles.submitButton} size="md">
           Entrar
         </Button>
 

src/pages/AuthRegister.tsx

@@ -113,7 +113,7 @@ export default function AuthRegister() {
         )}
 
         {/* Botão de chamada à ação principal que aciona a submissão dos dados (handleSubmit) */}
-        <Button onPress={handleSubmit} style={styles.submitButton} size="lg">
+        <Button onPress={handleSubmit} style={styles.submitButton} size="md">
           Criar conta
         </Button>
 

src/pages/Booking.tsx

@@ -255,7 +255,7 @@ export default function Booking() {
         )}
 
         {/* Botão para concretizar o INSERT na base de dados com as validações pré-acionadas */}
-        <Button onPress={submit} disabled={!canSubmit} style={styles.submitButton} size="lg">
+        <Button onPress={submit} disabled={!canSubmit} style={styles.submitButton} size="md">
           {user ? 'Confirmar Reserva' : 'Entrar para Reservar'}
         </Button>
       </Card>

src/pages/Landing.tsx

@@ -28,7 +28,7 @@ export default function Landing() {
           <Button
             onPress={() => navigation.navigate('Explore' as never)}
             style={styles.button}
-            size="lg"
+            size="md"
           >
             Ver Barbearias
           </Button>
@@ -37,7 +37,7 @@ export default function Landing() {
             onPress={() => navigation.navigate('Register' as never)}
             variant="outline"
             style={styles.button}
-            size="lg"
+            size="md"
           >
             Criar Conta
           </Button>