feat:mini apps: adicione telas placeholder para todos os oito mini apps (Notícias Trends, Campo Minado, Calculadora, Bloco de Notas, Conversor de Moedas, Criptomoedas, Jogo do Dinossauro, Jogo da Memória) e atualize navegação

lib/screens/calculator_screen.dart

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+import 'package:flutter/material.dart';
+
+class CalculatorScreen extends StatelessWidget {
+  const CalculatorScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Calculadora'),
+      ),
+      body: const Center(
+        child: Text('Calculadora - Em desenvolvimento'),
+      ),
+    );
+  }
+}

lib/screens/crypto_screen.dart

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+import 'package:flutter/material.dart';
+
+class CryptoScreen extends StatelessWidget {
+  const CryptoScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Criptomoedas'),
+      ),
+      body: const Center(
+        child: Text('Criptomoedas - Em desenvolvimento'),
+      ),
+    );
+  }
+}

lib/screens/currency_screen.dart

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+import 'package:flutter/material.dart';
+
+class CurrencyScreen extends StatelessWidget {
+  const CurrencyScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Conversor de Moedas'),
+      ),
+      body: const Center(
+        child: Text('Conversor de Moedas - Em desenvolvimento'),
+      ),
+    );
+  }
+}

lib/screens/dino_screen.dart

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+import 'package:flutter/material.dart';
+
+class DinoScreen extends StatelessWidget {
+  const DinoScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Jogo do Dinossauro'),
+      ),
+      body: const Center(
+        child: Text('Jogo do Dinossauro - Em desenvolvimento'),
+      ),
+    );
+  }
+}

lib/screens/memory_screen.dart

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+import 'package:flutter/material.dart';
+
+class MemoryScreen extends StatelessWidget {
+  const MemoryScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Jogo da Memória'),
+      ),
+      body: const Center(
+        child: Text('Jogo da Memória - Em desenvolvimento'),
+      ),
+    );
+  }
+}

lib/screens/minesweeper_screen.dart

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+import 'package:flutter/material.dart';
+
+class MinesweeperScreen extends StatelessWidget {
+  const MinesweeperScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Campo Minado'),
+      ),
+      body: const Center(
+        child: Text('Campo Minado - Em desenvolvimento'),
+      ),
+    );
+  }
+}

lib/screens/news_screen.dart

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+import 'package:flutter/material.dart';
+
+class NewsScreen extends StatelessWidget {
+  const NewsScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Notícias Trends'),
+      ),
+      body: const Center(
+        child: Text('Notícias Trends - Em desenvolvimento'),
+      ),
+    );
+  }
+}

lib/screens/notes_screen.dart

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+import 'package:flutter/material.dart';
+
+class NotesScreen extends StatelessWidget {
+  const NotesScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Bloco de Notas'),
+      ),
+      body: const Center(
+        child: Text('Bloco de Notas - Em desenvolvimento'),
+      ),
+    );
+  }
+}