Add CatIcon component and update app icon

- Introduced a new CatIcon component in TypeScript using React Native and SVG.
- The CatIcon supports customizable size, color, and optional background.
- Updated the app's icon image located at mobile/assets/icon.png.

mobile/app/(auth)/login.tsx

@@ -11,6 +11,7 @@ import { Button } from '@presentation/components/ui/Button';
 import { colors, typography, spacing } from '@shared/theme';
 import { loginUseCase } from '@infrastructure/container';
 import { useAuthStore } from '@store/authStore';
+import { CatIcon } from '@presentation/components/icons/CatIcon';
 
 const schema = z.object({
   email: z.string().email('E-mail inválido'),
@@ -64,9 +65,7 @@ export default function LoginScreen(): React.ReactElement {
     <Screen scrollable keyboardAvoiding>
       {/* Logo */}
       <View style={styles.hero}>
-        <View style={styles.logoContainer}>
-          <Ionicons name="paw" size={48} color={colors.accent} />
-        </View>
+        <CatIcon size={48} color="#1E1B18" withBackground backgroundColor={colors.accent} />
         <Text style={styles.appName}>MeowSpool</Text>
         <Text style={styles.tagline}>Gerencie seus filamentos com precisão.</Text>
       </View>
@@ -78,7 +77,7 @@ export default function LoginScreen(): React.ReactElement {
           name="email"
           render={({ field }) => (
             <Input
-              label="E-MAIL"
+              label="E-mail"
               placeholder="seu@email.com"
               keyboardType="email-address"
               autoComplete="email"
@@ -95,7 +94,7 @@ export default function LoginScreen(): React.ReactElement {
           name="password"
           render={({ field }) => (
             <Input
-              label="SENHA"
+              label="Senha"
               placeholder="••••••••"
               isPassword
               leftIcon={<Ionicons name="lock-closed-outline" size={18} color={colors.textSecondary} />}
@@ -149,15 +148,6 @@ const styles = StyleSheet.create({
     paddingBottom: spacing[10],
     gap: spacing[2],
   },
-  logoContainer: {
-    width: 80,
-    height: 80,
-    borderRadius: 20,
-    backgroundColor: colors.bgSurface,
-    alignItems: 'center',
-    justifyContent: 'center',
-    marginBottom: spacing[2],
-  },
   appName: {
     fontFamily: typography.fontFamily.ui,
     fontSize: typography.fontSize['2xl'],