Add Sentry integration

.github/workflows/build.yml

@@ -25,6 +25,8 @@ jobs:
       MACOS_APPLE_ID: ${{ secrets.MACOS_APPLE_ID }}
       # App-specific password generated at appleid.apple.com for notarization.
       MACOS_APPLE_PASSWORD: ${{ secrets.MACOS_APPLE_PASSWORD }}
+      # Sentry project DSN used for production telemetry.
+      SENTRY_DSN: ${{ secrets.SENTRY_DSN }}
 
     steps:
       - uses: actions/checkout@v6

.gitignore

@@ -1,6 +1,9 @@
 # Node dependencies.
 node_modules/
 
+# Local environment.
+.env
+
 # Build output.
 build/
 dist/

README.md

@@ -55,5 +55,8 @@ npm install
 npm run build
 ```
 
+Production Sentry telemetry is included only when `SENTRY_DSN` is set during the build.
+Release builds read it from the `SENTRY_DSN` GitHub Actions secret.
+
 If you need to sign and notarize the application, see the [.github/workflows/build.yml](.github/workflows/build.yml) 
 for a ready-to-use script that works on macOS and Windows.