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)

components/ErrorBoundary.tsx

@@ -0,0 +1,71 @@
+import React, { Component, ErrorInfo, ReactNode } from 'react';
+
+interface Props {
+  children: ReactNode;
+  fallback?: ReactNode;
+}
+
+interface State {
+  hasError: boolean;
+  error: Error | null;
+}
+
+export class ErrorBoundary extends Component<Props, State> {
+  constructor(props: Props) {
+    super(props);
+    this.state = { hasError: false, error: null };
+  }
+
+  static getDerivedStateFromError(error: Error): State {
+    return { hasError: true, error };
+  }
+
+  componentDidCatch(error: Error, errorInfo: ErrorInfo): void {
+    console.error('Erro capturado pelo ErrorBoundary:', error, errorInfo);
+  }
+
+  handleReset = (): void => {
+    this.setState({ hasError: false, error: null });
+  };
+
+  render(): ReactNode {
+    if (this.state.hasError) {
+      if (this.props.fallback) {
+        return this.props.fallback;
+      }
+
+      return (
+        <div className="min-h-screen flex items-center justify-center p-4 bg-slate-100 dark:bg-slate-900">
+          <div className="max-w-md w-full bg-white dark:bg-slate-800 rounded-2xl shadow-xl p-8 text-center">
+            <div className="w-16 h-16 mx-auto mb-6 bg-red-100 dark:bg-red-900/30 rounded-full flex items-center justify-center">
+              <svg className="w-8 h-8 text-red-600 dark:text-red-400" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z" />
+              </svg>
+            </div>
+            <h2 className="text-2xl font-display font-bold text-slate-800 dark:text-white mb-2">
+              Algo deu errado
+            </h2>
+            <p className="text-slate-500 dark:text-slate-400 mb-6">
+              Ocorreu um erro inesperado. Por favor, tente novamente.
+            </p>
+            {this.state.error && (
+              <div className="mb-6 p-4 bg-red-50 dark:bg-red-900/20 rounded-xl text-left">
+                <p className="text-xs font-mono text-red-600 dark:text-red-400 break-words">
+                  {this.state.error.message}
+                </p>
+              </div>
+            )}
+            <button
+              onClick={this.handleReset}
+              className="w-full bg-gradient-to-r from-blue-600 to-indigo-600 hover:from-blue-700 hover:to-indigo-700 text-white font-bold py-3 px-6 rounded-xl transition-all"
+            >
+              Tentar novamente
+            </button>
+          </div>
+        </div>
+      );
+    }
+
+    return this.props.children;
+  }
+}