fix: resolve PR #127 dependency build failures (#127)

- Apply all compatible Dependabot package updates
- Skip vite 8.x (CSS lightningcss incompatibility with Tailwind 4)
- Skip TypeScript 6.x (baseUrl deprecation breaks build)
- Skip eslint 10.x + eslint-plugin-react-hooks 7.x (new rules break existing code)
- Keep @vitejs/plugin-react at 5.x (v6 requires vite 8)
- Add react-is as explicit dependency (required by recharts 3.8.x)
- Add @testing-library/dom as dev dependency (required by @testing-library/react 16.3.2)
- Increase vitest testTimeout to 15s (App dynamic import slower with updated packages)

Co-authored-by: Rob Bos <raj.bos@gmail.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 3 people

.github/workflows/deploy-to-pages.yml

@@ -40,7 +40,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: "18"
+          node-version: "20"
           cache: 'npm'
 
       - name: Install dependencies