Polish AI Labs mobile layout

docs/CODEX_EXECUTION_LOG.md

@@ -2794,3 +2794,29 @@ Limitations:
 
 Next recommended pass:
 - Continue with AI Labs mobile/density polish, especially detection and segmentation forms/tables.
+
+## Sprint 75 AI Labs mobile visual polish (2026-06-20)
+
+Changed:
+- Added mobile-density CSS for Detection and Segmentation Lab model cards, run forms and result summaries.
+- Added overflow wrapping for long model ids, source tile paths, mask paths and QA summary values.
+- Kept AI result tables scroll-contained while reducing their mobile minimum width.
+- Added `backend/tests/test_sprint75_ai_labs_mobile_polish.py`.
+- Updated `frontend/README.md`, `docs/TODO.md` and `CHANGELOG.md`.
+
+Tested:
+- Red step: `python -m pytest backend/tests/test_sprint75_ai_labs_mobile_polish.py -q` failed on missing AI Labs mobile CSS contracts.
+- `python -m pytest backend/tests/test_sprint75_ai_labs_mobile_polish.py backend/tests/test_sprint74_data_map_mobile_polish.py backend/tests/test_sprint72_mobile_overflow_hardening.py backend/tests/test_sprint62_frontend_visual_polish.py backend/tests/test_sprint30_workbench_components.py backend/tests/test_sprint8c_detection_visualization_qa.py backend/tests/test_sprint9_segmentation_foundation.py -q` (`30 passed`)
+- `cd frontend && npm run typecheck`
+- `cd frontend && npm run build`
+- Local browser check against `http://127.0.0.1:5179` with live API proxy at a 390px viewport: AI Labs rendered 2 panels, 7 model cards, 6 lab blocks and 4 lab forms with no body-level horizontal overflow.
+- Screenshot captured under `artifacts/sprint75-ai-labs-mobile-polish/`.
+
+Open:
+- Run full readiness, redeploy Tower and verify live AI Labs mobile polish after deployment.
+
+Limitations:
+- Frontend CSS polish only; no Detection/Segmentation workflow, API, persistence, migration, provider or AI/model changes.
+
+Next recommended pass:
+- Continue with Export/System mobile-density polish, especially export action cards and provider capability lists.