feat: use npm-bundled Sentry instead of CDN (#181)

Bundle @sentry/browser with esbuild into a local script served
from the same origin. All Sentry calls are guarded with
window.Sentry checks so adblockers won't break page functionality.
SENTRY_DSN is injected at build time via environment variable.

Author: robertodauria

.github/workflows/firebase-hosting-merge.yml

@@ -24,6 +24,8 @@ jobs:
           node-version: '20'
       - run: npm ci
       - run: npm run build -- prod
+        env:
+          SENTRY_DSN: ${{ secrets.SENTRY_DSN }}
       - uses: FirebaseExtended/action-hosting-deploy@v0
         with:
           repoToken: '${{ secrets.GITHUB_TOKEN }}'

.github/workflows/firebase-hosting-pull-request.yml

@@ -23,6 +23,8 @@ jobs:
           node-version: '20'
       - run: npm ci
       - run: npm run build -- staging
+        env:
+          SENTRY_DSN: ${{ secrets.SENTRY_DSN }}
       - uses: FirebaseExtended/action-hosting-deploy@v0
         with:
           repoToken: '${{ secrets.GITHUB_TOKEN }}'