chore: add Jest testing dependencies

- Add jest, @types/jest, and ts-jest for testing
- Add @types/mssql for TypeScript support

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

package.json

@@ -35,6 +35,8 @@
     "@electron-toolkit/eslint-config-prettier": "^3.0.0",
     "@electron-toolkit/eslint-config-ts": "^3.1.0",
     "@electron-toolkit/tsconfig": "^2.0.0",
+    "@types/jest": "^30.0.0",
+    "@types/mssql": "^9.1.9",
     "@types/node": "^22.19.1",
     "@types/react": "^19.2.7",
     "@types/react-dom": "^19.2.3",
@@ -46,9 +48,11 @@
     "eslint-plugin-react": "^7.37.5",
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.4.24",
+    "jest": "^30.2.0",
     "prettier": "^3.7.4",
     "react": "^19.2.1",
     "react-dom": "^19.2.1",
+    "ts-jest": "^29.4.6",
     "typescript": "^5.9.3",
     "vite": "^7.2.6"
   }