fix(theme): use current theme as fallback in preferences, prevent session override of localStorage

src/features/onboarding/steps/step-preferences.tsx

@@ -24,9 +24,9 @@ const AVATAR_COLORS = [
 
 export const StepPreferences = () => {
   const { next, updateContext, state } = useOnboarding();
-  const { setTheme } = useTheme();
+  const { theme: currentTheme, setTheme } = useTheme();
   const preferences = state?.context.flowData.preferences ?? {
-    theme: "dark" as const,
+    theme: (currentTheme ?? "system") as ThemeKey,
   };
   const account = state?.context.flowData.account as
     | OnboardingAccountData

src/features/theme/theme-meta-updater.tsx

@@ -15,7 +15,13 @@ export function ThemeMetaUpdater() {
 
     useEffect(() => {
         if (isPending || !session?.user?.theme) return;
+        // Only apply the DB theme if the browser has no locally stored preference.
+        // This prevents a stale session value from overriding a theme the user
+        // just selected (localStorage is always written first by next-themes).
+        const stored = localStorage.getItem("theme");
+        if (!stored) {
             setTheme(session.user.theme);
+        }
     }, [session, isPending, setTheme]);
 
     useEffect(() => {