Fix screenshot tests failing in CI by tagging style_screen_screenshot_test

The `style_screen_screenshot_test.dart` was missing the `@Tags(['screenshot'])` annotation, causing it to:
1. Run during regular test execution (with `--exclude-tags=screenshot`)
2. Fail golden file validation (screenshots don't exist or differ in CI)
3. Not run during screenshot generation (only `test/screenshots/` folder was targeted)

Fixed by:
- Adding `@Tags(['screenshot'])` to `test/style_screen_screenshot_test.dart`
- Changing workflow to use `--tags=screenshot` instead of targeting `test/screenshots/` directory

This ensures:
- Screenshot tests are excluded from regular test runs
- All screenshot tests (regardless of location) run during screenshot generation
- No test failures due to golden file mismatches

Co-authored-by: richardthe3rd <573334+richardthe3rd@users.noreply.github.com>

Author: Copilot

.github/workflows/build-deploy.yml

@@ -78,7 +78,7 @@ jobs:
         run: cp coverage/lcov.info coverage/lcov.main.info
 
       - name: Run screenshot tests with coverage
-        run: flutter test test/screenshots/ --update-goldens --coverage
+        run: flutter test --tags=screenshot --update-goldens --coverage
 
       - name: Install lcov for merging coverage
         run: sudo apt-get update && sudo apt-get install -y lcov

test/style_screen_screenshot_test.dart

@@ -9,6 +9,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 
 import 'provider_test.mocks.dart';
 
+@Tags(['screenshot'])
 void main() {
   group('StyleScreen Screenshot Tests', () {
     late MockBeerApiService mockApiService;