Phase 1 — Next Steps (Small, Mergeable PRs)

MUI v4 → v5 import fix
- Run: bash scripts/dev/phase1/fix-mui-imports.sh --dry then --apply.
- Commit only the touched files + reports/phase1-*/notes.txt (optional).
Remove TS suppressions
- Run: bash scripts/dev/phase1/fail-on-suppressions.sh (or --allow=1 while fixing one file per PR).
- Convert ignored sections to proper types or refactor.
A11y: <img> alt text
- Run: bash scripts/dev/phase1/list-imgs-missing-alt.sh and fix each instance (alt or alt="" if decorative).

Keep each PR focused (1–5 files), branch from update, and let CI run.