add: themes for wishlists and dashboards

src/routes/dashboard/+page.svelte

@@ -11,6 +11,30 @@
 
 	let { data }: { data: PageData } = $props();
 
+	// For anonymous users, get theme from localStorage
+	function getInitialTheme() {
+		if (data.isAuthenticated) {
+			return data.user?.dashboardTheme || 'none';
+		} else {
+			// Anonymous user - get from localStorage
+			if (typeof window !== 'undefined') {
+				return localStorage.getItem('dashboardTheme') || 'none';
+			}
+			return 'none';
+		}
+	}
+
+	let currentTheme = $state(getInitialTheme());
+
+	// Save to localStorage when theme changes for anonymous users
+	function handleThemeUpdate(theme: string | null) {
+		currentTheme = theme || 'none';
+
+		if (!data.isAuthenticated && typeof window !== 'undefined') {
+			localStorage.setItem('dashboardTheme', currentTheme);
+		}
+	}
+
 	const t = $derived(languageStore.t);
 
 	// Only owned wishlists for "My Wishlists"
@@ -34,11 +58,13 @@
 	});
 </script>
 
-<PageContainer theme={data.user?.dashboardTheme} themeColor="hsl(var(--primary))">
+<PageContainer theme={currentTheme} themeColor="#3b82f6">
 	<DashboardHeader
 		userName={data.user?.name}
 		userEmail={data.user?.email}
-		dashboardTheme={data.user?.dashboardTheme || 'none'}
+		dashboardTheme={currentTheme}
+		isAuthenticated={data.isAuthenticated}
+		onThemeUpdate={handleThemeUpdate}
 	/>
 
 	<!-- Local Wishlists Section (for anonymous and authenticated users) -->