fix(theme): improve light mode contrast across instance and options pages

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/common/static/instance_theme.js

@@ -4,7 +4,7 @@
 (function (global) {
   const STANDALONE_KEY = "instance-theme";
   const HUB_LINKED_THEME_KEY = "hub-linked-theme";
-  const META = { dark: "#0b0d14", light: "#d8e2ec" };
+  const META = { dark: "#0b0d14", light: "#c8d4de" };
 
   function normalize(theme) {
     return theme === "light" ? "light" : "dark";