fix(instance): light-theme journal AI buttons and mood checkboxes

Fix secondary button contrast, exclude checkboxes from dark input fill, style mood-grid; bump theme assets to v4.

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

static/instance_theme.js

@@ -117,10 +117,14 @@
   function remapInlineStyle(style, theme) {
     if (!style) return style;
     if (theme !== "light") return style;
+    const hadSecondaryBtnBg = /#1f3a5a/i.test(style);
     let out = style;
     for (const [from, to] of Object.entries(INLINE_HEX_LIGHT)) {
       out = out.replace(new RegExp(from.replace("#", "\\#"), "gi"), to);
     }
+    if (hadSecondaryBtnBg && !/color\s*:/i.test(style)) {
+      out = `${out.replace(/;+\s*$/, "")};color:#006e9a`;
+    }
     return out;
   }