/art redesign: "The Story" editorial page (writeup + palette + frame + share)

Rebuilt /art to CD's "The Story" hybrid: a warm-tan editorial card with the
Daily-Art purple accent. Left = guide write-up (kicker · title · attribution ·
the museum-guide blurb · Collection/Rights · View at The Met). Right = the framed
piece (our existing frame + thickness customizer, on one line each) on a deeper-
tan ground, then a divider, the "Colors in this piece" palette, and Share /
Download (Download gated on public-domain license; image is same-origin so it
just works). Self-hosted Space Mono for the curatorial micro-labels; Newsreader
display + Hanken UI like the rest of the hub.

Mobile: the left/right wrappers collapse (display:contents) so the blocks reflow
to head → artwork → writeup → controls — the art sits high, seen before it's read.
Kept HubBar, the Back button, and the fullscreen lightbox (incl. landscape rotate).
Save-to-account + framed-composite export deferred to Phase 2.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/static/fonts/CREDITS.txt

@@ -7,3 +7,5 @@ newsreader-var.woff2 / newsreader-italic-var.woff2 — "Newsreader" by Productio
 License: SIL Open Font License 1.1. All self-hosted (no Google hotlink) for the /home3 design direction.
 
 Work Sans — Wei Huang, OFL 1.1 (Google Fonts). Latin subset, variable 400–700.
+
+Space Mono — Colophon Foundry, OFL 1.1 (Google Fonts). Latin subset, 400.