Polish workbench result states

docs/CODEX_EXECUTION_LOG.md

@@ -2956,3 +2956,30 @@ Limitations:
 
 Next recommended pass:
 - Continue with compact empty/error-state polish across QA, exports and AI lab result panels.
+
+## Sprint 81 Result state consistency polish (2026-06-20)
+
+Changed:
+- Added shared `result-state` CSS variants for loading, error, empty and ready states.
+- Applied result-state blocks to QA/QC error/empty/filter-empty states.
+- Applied result-state blocks to export loading, error and empty/filter-empty states.
+- Applied result-state blocks to Detection and Segmentation model loading/errors, empty registries, result counts and QA/run errors.
+- Added `backend/tests/test_sprint81_result_state_polish.py`.
+- Updated `frontend/README.md`, `docs/TODO.md` and `CHANGELOG.md`.
+
+Tested:
+- Red step: `python -m pytest backend/tests/test_sprint81_result_state_polish.py -q` failed on missing result-state CSS and panel markup contracts.
+- `python -m pytest backend/tests/test_sprint81_result_state_polish.py -q` (`3 passed`)
+- `python -m pytest backend/tests/test_sprint81_result_state_polish.py backend/tests/test_sprint80_operation_form_readability.py backend/tests/test_sprint75_ai_labs_mobile_polish.py backend/tests/test_sprint76_export_system_mobile_polish.py backend/tests/test_sprint73_quality_result_filtering.py backend/tests/test_sprint70_quality_handoff_polish.py backend/tests/test_sprint8c_detection_visualization_qa.py backend/tests/test_sprint9_segmentation_foundation.py -q` (`34 passed`)
+- `cd frontend && npm run typecheck`
+- `cd frontend && npm run build`
+- `bash scripts/run_readiness_check.sh` (`276 passed`; frontend typecheck/build passed; Alembic single head `202606120900`)
+
+Open:
+- Run full readiness, redeploy Tower and verify live runtime smoke after deployment.
+
+Limitations:
+- Frontend presentation/state polish only; no workflow behavior, API contract, persistence, migration, provider fetching or AI/model changes.
+
+Next recommended pass:
+- Continue with visual density review for topbar/sidebar/responsive shell after another live browser pass.

docs/TODO.md

@@ -70,6 +70,7 @@ This file now starts with the current implementation status. Older preparation/b
 - [x] Add export preview readability polish for large JSON/GeoJSON handoff artifacts.
 - [x] Add accessibility focus polish for primary workbench keyboard navigation.
 - [x] Add raster/vector operation form readability polish for dense tool panels.
+- [x] Add compact loading/error/empty/result state polish across QA, exports and AI labs.
 
 ## Sprint 8 status