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chore: visual-diff script for parity check master

Add scripts/visual-diff.ts that captures screenshots of 10 URLs from both the live arter.dev and the local dev server, writing 20 PNGs to .visual-diff/{old,new}/. Add pnpm visual:diff script entry and exclude .visual-diff/ from git. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>