# Correctness Sweep I — MUI v4 imports & ts-nocheck removal

## Goal

Remove known correctness hazards blocking development.

## Targets

- Replace `@material-ui/*` imports with `@mui/*`
- Remove `@ts-nocheck` in editor and app; add minimal types
- Ensure app still builds/boots after changes

## Acceptance

- No remaining v4 imports; no ts-nocheck in core paths
- Smoke tests green; manual run shows editor screen
- See docs/QUALITY_CHARTER.md.

## Labels

Type: fix · Area: editor · Priority: P0 · Size: M

**Labels:** fix, P0, M, editor
**Milestone:** Patch 0 — Orientation & Quality Bar