test(): added html report to CI run

src/backend/justfile

@@ -69,12 +69,13 @@ show-coverage:
 # run tests, produce junit report
 [group('ci')]
 ci-test:
-    @ mkdir -p reports .cov
+    @ mkdir -p reports .cov ./.cov/html
     @ uv run coverage run --source="." manage.py test \
         --testrunner=xmlrunner.extra.djangotestrunner.XMLTestRunner \
         --settings="config.settings.ci"
     @ uv run coverage report | tee .cov/coverage.txt
     @ uv run coverage xml -o .cov/coverage.xml
+    @ uv run coverage html -d .cov/html
 
 # generates migrations
 [group('generate')]