feat(home): swap in the higher-fidelity hero artwork

Same 16:9 frame, but not a drop-in replacement — the composition, palette and
copy area all moved, and each one drives a change here.

COPY AREA

The old artwork was a flat #FDF9F3 down its whole left side. This one runs
peach #FEE8D2 at the top to cream #FDF3E7 around 43% height, and below ~48%
the left edge is foliage rather than cream at all. --hero-ground is resampled
to #FEF2E1, the middle of the pale run where the headline and search actually
sit; the scrim covers the foliage further down.

Measured on rendered pixels with the text hidden, sampling the real glyph runs
(via Range, not the element boxes) plus a 120px growth margin:

           title      body      byline
  light    13.61:1    5.74:1    6.66:1
  dark      9.49:1    5.45:1    8.35:1

Body drops from 6.52:1 to 5.74:1 as the foliage comes closer, still clear.

BAND CROP

The schoolhouse moved to ~82% across the frame, leaving only ~140px of artwork
to its right, so the band crop is anchored to the right edge and takes 1344px
back — putting the school at 73%, which the build script now derives and
prints rather than leaving it to drift from the CSS.

The crop is also 3.2:1 rather than matching the phone. The band is not one
ratio: it runs 2.4:1 on a phone to about 3.8:1 under the one-column
breakpoint. Cropping at the narrow end means the wide end throws away height,
which cut the flag off the roof and the base off the building. Sitting above
the middle costs a little width on phones — where the crop's left is hillside —
and keeps the building whole where it matters.

BAND HEIGHTS

Raised to 13rem (861–860px) and 10rem (≤640px). The band was widest-per-height
at exactly 640px, where an 8.5rem band measured 4.2:1 — worse than any wider
viewport, because the height steps down at that breakpoint while the width does
not. Ratios across the range are now 2.0 / 2.6 / 3.6 / 3.1 / 3.8 rather than
spiking. The search still lands at 442px on a 667px viewport.

WEIGHT

Source is 3.1MB; a browser fetches one file — 29–59kB on desktop, 10–14kB on a
phone. Widths re-cut for the larger master: 2000/1400/1000 wide, 1344/900/600
band.

Verified: 0 AA failures across both themes at 1440 / 860 / 390, every srcset
entry present on disk with no orphans, tsc clean, 159/159, build green.

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

nextjs-app/components/HomeView.module.css

@@ -323,15 +323,21 @@
     padding: 1.75rem 1.5rem 1.75rem;
     max-width: none;
   }
+  /* 13rem, not 11: at 860px an 11rem band is 4.5:1, and squeezing the 3.2:1
+     crop into that throws away enough height to cut the flag off the roof and
+     the base off the building. 13rem holds it at about 3.8:1, where the
+     building stays whole. */
   .heroArt {
     position: static;
     order: -1;
-    height: 11rem;
+    height: 13rem;
   }
-  /* The band crop centres the schoolhouse at about 65% across, so squeezing
-     toward 4.9:1 crops the empty sides rather than the subject. */
+  /* The band crop puts the schoolhouse at 73% across — reported by
+     scripts/build-hero-images.js, which derives it from the crop box rather
+     than leaving the two to drift. Squeezing narrower then crops the emptier
+     left side rather than the subject. */
   .heroArt img {
-    object-position: 65% center;
+    object-position: 73% center;
   }
   /* The scrim exists to protect text sitting on the artwork. Nothing sits on
      it here, and leaving it would wash the band out. */
@@ -372,8 +378,12 @@
     font-size: 1.75rem;
     margin-bottom: 0.5rem;
   }
+  /* 10rem, not 8.5: the band is widest-per-height right at this breakpoint —
+     at 640px an 8.5rem band is 4.2:1, worse than anything above it, because
+     the height steps down here while the width does not. 10rem keeps it near
+     3.6:1, in line with the rest of the range. */
   .heroArt {
-    height: 8.5rem;
+    height: 10rem;
   }
 }