Improve body bg in light theme

.changeset/light-body-bg-decoupled.md

@@ -0,0 +1,7 @@
+---
+"ada-ui": patch
+---
+
+Decoupled the light-mode body background from --100 so themes that lift it for
+text contrast no longer wash the page out to near-white, and held jupiter-2's
+body at its cream hue

scss/_ada.theme-base.scss

@@ -62,7 +62,10 @@
   --bg-body: var(--color950);
   --fg-body: var(--color100);
 
-  --bg-body-light: var(--color100);
+  // Hardcoded pale, NOT var(--color100): themes lift --100 to clear AAA for ink
+  // on solid buttons (teal 0.98, jupiter-2 0.947), and riding on it washed the
+  // page out to near-white. This is the ladder pale, so ramp themes are unchanged.
+  --bg-body-light: oklch(0.91 0.05 var(--hue));
   // Light-mode ink, per tone — headings, .input and .command.outline re-resolve
   // it. L 0.30 (as --reading-light) clears AAA on the pale body. Chroma capped:
   // darker saturated hues leave sRGB, and Chromium's gamut mapping turns

scss/ada.jupiter-2.scss

@@ -22,6 +22,10 @@
   --100: 0.947 0.007 81; // body + button text (#F0EDE8)
   // Light theme would otherwise put orange (color800) text on cream — force navy.
   --fg-body-light: var(--color950);
+  // Same lightness step as the other themes, but held at the cream hue (81) and
+  // low chroma: the base pale builds on --base-hue, and 49 at 0.05 is the accent
+  // orange — the page came out peach. Cream, a shade deeper than --100.
+  --bg-body-light: oklch(0.91 0.02 81);
 
   // Curated to keep the theme's text identity: cream dark, navy ink light
   // (derived defaults would lean peach / dark-brown off the orange primary).