fix(details): use text-blue-700 in JsonViewer (dark-mode coverage lint, #433)

The dark-mode coverage script in scripts/check-dark-mode-coverage.mjs
linted against text-blue-600 (no .dark remap in apps/web/src/index.css);
the JSX-side dark:text-blue-400 variant alone is not what the script
accepts. Switching to text-blue-700 uses the existing .dark .text-blue-700
remap in index.css.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: martin-castro-laminr-ai

frontend/packages/details/src/JsonViewer.tsx

@@ -68,7 +68,11 @@ function Node({ value, depth }: { value: unknown; depth: number }) {
       <span className="text-purple-600 dark:text-purple-400">{value ? 'true' : 'false'}</span>
     );
   if (typeof value === 'number')
-    return <span className="text-blue-600 dark:text-blue-400">{String(value)}</span>;
+    // Use text-blue-700 (the variant with a `.dark` remap in
+    // apps/web/src/index.css) so dark-mode coverage is automatic
+    // — the JSX-side `dark:` variant alone is not what the
+    // check-dark-mode-coverage.mjs lint accepts (#433).
+    return <span className="text-blue-700">{String(value)}</span>;
   if (typeof value === 'string')
     return (
       <span className="text-green-700 dark:text-green-400">