Add auth/api, sessions page and CI envs

Add authentication and API helpers and a sessions page: created src/lib/api.ts and src/lib/auth.ts, added src/pages/sessions/index.astro, and updated src/pages/index.astro and src/layouts/BaseLayout.astro to integrate these changes. Update CI to expose PUBLIC_KE_AR_API_KEY, PUBLIC_KE_AR_API_URL and PASSWORD as build env vars in .github/workflows/astro.yml. Also add dev tooling (@astrojs/check and TypeScript) to package.json and regenerate package-lock.json.

Author: j0nes-L

.github/workflows/astro.yml

@@ -72,6 +72,10 @@ jobs:
             --site "${{ steps.pages.outputs.origin }}" \
             --base "${{ steps.pages.outputs.base_path }}"
         working-directory: ${{ env.BUILD_PATH }}
+        env:
+          PUBLIC_KE_AR_API_KEY: ${{ secrets.PUBLIC_KE_AR_API_KEY }}
+          PUBLIC_KE_AR_API_URL: ${{ secrets.PUBLIC_KE_AR_API_URL }}
+          PASSWORD: ${{ secrets.PASSWORD }}
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with: