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)

package.json

@@ -6,19 +6,25 @@
   "scripts": {
     "dev": "vite",
     "build": "vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "dependencies": {
-    "react": "^19.2.0",
     "@google/genai": "^1.29.1",
-    "react-dom": "^19.2.0",
     "html2canvas": "^1.4.1",
-    "jspdf": "^3.0.3"
+    "jspdf": "^3.0.3",
+    "react": "^19.2.0",
+    "react-dom": "^19.2.0"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.2",
     "@types/node": "^22.14.0",
     "@vitejs/plugin-react": "^5.0.0",
+    "jsdom": "^29.0.1",
     "typescript": "~5.8.2",
-    "vite": "^6.2.0"
+    "vite": "^6.2.0",
+    "vitest": "^4.1.2"
   }
 }