**Title:** Phase 1 — Step 1A: Remove `@ts-nocheck` headers

**Summary**

- Remove blanket `@ts-nocheck` headers to restore type safety.
- No behavior changes.

**Details**

- Files touched: see diff (e.g., `src/App.tsx`, `src/components/editor/BlogEditor.tsx`).
- Leave per-line todo comments in follow-ups instead of blanket disables.

**Verification**

- `scripts/dev/check.sh` (Vitest run + lint:phase0) → green
- App still builds locally (if applicable): `npm run dev` quick smoke

**Follow-ups (tracked in Phase 1 issues)**

- Type hygiene & rule violations addressed file-by-file.