🤖 fix: allow unforced theme for local toggling, remove default dark override

Author: ammar-agent

.storybook/preview.tsx

@@ -11,7 +11,6 @@ const preview: Preview = {
     theme: {
       name: "Theme",
       description: "Choose between light and dark UI themes",
-      defaultValue: "dark",
       toolbar: {
         icon: "mirror",
         items: [
@@ -24,7 +23,7 @@ const preview: Preview = {
   },
   decorators: [
     (Story, context) => {
-      const mode = (context.globals.theme ?? "dark") as ThemeMode;
+      const mode = context.globals.theme as ThemeMode | undefined;
       return (
         <ThemeProvider forcedTheme={mode}>
           <Story />