chore(web): refresh stale blog visual baseline after #2825

The committed web/tests/visual-baselines/blog.png predates #2825 (the 4.0.2
release post), so any PR that doesn't itself touch web/content/blog/posts/
trips Visual regression on the blog canary -- the live blog index now has the
4.0.2 post as the top entry, shifting older posts down by one position.

The workflow's intended develop-side auto-refresh apparently did not land on
the #2825 push (likely the same branch-rule push rejection that bites the
pre-refresh-commit step on PR runs -- see the separate workflow-fix task).
Updating the baseline here unblocks this PR; the underlying workflow gate
fix is out-of-scope.

Diff inspected against the CI artifact -- the change is exactly the new
top-post reflow, no unintended layout shift.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Signed-off-by: Peter Amiri <peter@alurium.com>

Author: bpamiri