feat: add domain models and repositories for user, spool presets, and filaments

- Introduced SpoolPreset and User domain models with necessary DTOs and utility functions.
- Created AuthRepository, FilamentRepository, and SpoolPresetRepository interfaces for authentication and data management.
- Implemented UI components for filament display, including ColorSwatch, FilamentCard, and StockBar.
- Developed layout components such as Header and Screen for consistent app structure.
- Added reusable UI components like Badge, Button, Card, and Input for better user interaction.
- Established global constants and theme settings for consistent styling across the application.
- Implemented utility functions for filament calculations and formatting.
- Created Zustand stores for managing authentication, filament, and preset states.
- Configured TypeScript settings for improved development experience.

mobile/app/_layout.tsx

@@ -0,0 +1,28 @@
+import React, { useEffect } from 'react';
+import { Stack } from 'expo-router';
+import { StatusBar } from 'expo-status-bar';
+import { useAuthStore } from '@store/authStore';
+
+/**
+ * Root layout do expo-router.
+ * Carrega a sessão armazenada e controla o fluxo auth vs app.
+ */
+export default function RootLayout(): React.ReactElement | null {
+  const { loadStoredSession, isLoading } = useAuthStore();
+
+  useEffect(() => {
+    loadStoredSession();
+  }, [loadStoredSession]);
+
+  if (isLoading) return null;
+
+  return (
+    <>
+      <StatusBar style="light" backgroundColor="transparent" translucent />
+      <Stack screenOptions={{ headerShown: false, contentStyle: { backgroundColor: '#1E1B18' } }}>
+        <Stack.Screen name="(auth)" />
+        <Stack.Screen name="(app)" />
+      </Stack>
+    </>
+  );
+}