markdown/html_fragment (report, tasks, base themes) and the json/csv viewers
each used their own near-white background (cream #fffaf0, light-blue
#f7fbff, or plain white). They now all use #faf9f6 — the same off-white the
preview area uses for image/binary artifacts — so browsing across kinds is
visually consistent.
Left as-is on purpose: deck (intentional dark slide background; switching it
would require reworking its light text colors), html_full (served verbatim,
poster owns styling), and pdf (the browser's own viewer chrome). Existing
json/csv artifacts keep their baked-in #fffaf0, which is visually
indistinguishable from #faf9f6; only new ones get the exact value.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>