Update rendered design snapshots for the code block redesign

The code specimen's baseline changes to match the intentional header-bar
redesign (taller box for the new chrome). The table specimen's baseline
also shifts by a hair: it renders below the code specimen on the same
continuous audit page, and the code specimen's ~82px height growth
nudges its rasterization by a sub-pixel amount even after the fixture's
own fractional-scroll correction. Verified repeatable by rerunning
design:browser without --update-snapshots.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>