improvement: tasks feature UX fully overhauled.

AGENTS.md

@@ -45,6 +45,8 @@ frontend/src/
 - **History filters** are client-side only (`treatmentHistoryFilters.ts`): “Not shipped to lab” + single date on already-fetched patient history; includes live current draft when filtering.
 - **Lab case comments** on a detail when sent and lab case tasks are not all `COMPLETED` (`taskProgress` from API).
 
+**Lab Tasks tab:** Newest case first; steps ordered 1→N; case grouping when sorted by date; `stepCompleted` filter; prosthesis colors from `PROSTHESIS_TYPE_COLORS` via catalog — see `.cursor/skills/lab-tasks/SKILL.md`.
+
 ## Backend layout
 
 ```
@@ -67,6 +69,7 @@ Errors: `AppException` + `ErrorCode` → frontend `getUserFacingError()`. Never
 |-------|-------------|
 | `.cursor/skills/add-feature/` | New tab, API module, or end-to-end feature |
 | `.cursor/skills/treatment-workspace/` | Treatment tab: preview vs form, history, load flow, drafts |
+| `.cursor/skills/lab-tasks/` | Lab Tasks tab: sort, case grouping, step-completed filter, prosthesis colors |
 | `.cursor/skills/frontend-structure/` | Moving components, auditing folder layout |
 | `.cursor/skills/api-errors/` | New backend errors + frontend translations |