Fix @theme block structure - add missing closing brace

The original @theme block was missing its closing brace before the light theme block was added, causing the light theme to be nested inside @theme.

Author: kylecarbs

src/browser/styles/globals.css

@@ -189,6 +189,9 @@
   /* Error backgrounds */
   --color-error-bg-dark: hsl(0 33% 13%); /* #3c1f1f - dark error bg */
 
+  /* Radius */
+  --radius: 0.5rem;
+}
 
 /* Light theme overrides using standard CSS selector */
 [data-theme="light"] {
@@ -366,10 +369,6 @@
   --radius: 0.5rem;
 }
 
-  /* Radius */
-  --radius: 0.5rem;
-}
-
 :root {
   /* Legacy RGB for special uses */
   --plan-mode-rgb: 31, 107, 184;