Expand Seg task coverage and coverage dashboard

backend/tests/test_coverage.py

@@ -0,0 +1,8 @@
+from app.coverage import get_coverage_report
+
+
+def test_coverage_report_maps_user_scripts_and_builds_tasks():
+    report = get_coverage_report()
+    assert report["mapped_user_scripts"] == report["user_scripts_total"]
+    assert report["unmapped_user_scripts"] == []
+    assert report["task_build_passed"] is True