feat: multi-provider AI support with auto-detection

- Added support for Google Gemini, OpenAI, Anthropic, and Azure OpenAI
- Implemented API key validation with auto model detection
- Added Error Boundary for better error handling
- Migrated PDF generation to native jsPDF (better quality)
- Added PWA support with offline capabilities
- Implemented tests with Vitest
- Fixed language consistency (PT-BR)
- Improved accessibility (ARIA)

index.tsx

@@ -2,6 +2,7 @@ import React from 'react';
 import ReactDOM from 'react-dom/client';
 import App from './App';
 import { ThemeProvider } from './context/ThemeContext';
+import { ErrorBoundary } from './components/ErrorBoundary';
 import './index.css';
 
 const rootElement = document.getElementById('root');
@@ -12,8 +13,10 @@ if (!rootElement) {
 const root = ReactDOM.createRoot(rootElement);
 root.render(
   <React.StrictMode>
-    <ThemeProvider>
-      <App />
-    </ThemeProvider>
+    <ErrorBoundary>
+      <ThemeProvider>
+        <App />
+      </ThemeProvider>
+    </ErrorBoundary>
   </React.StrictMode>
 );