add platform demo fam

frontend/src/routes/[fam]/+layout.svelte

@@ -32,6 +32,7 @@
 	let session = $state<Session | null>(data.session);
 	let isParent = $state(data.isParent);
 	let role = $state(data.role);
+	let isDemo = $state(data.demoMode);
 	let famName = $derived(
 		famStore.initialized ? (famStore.fam as any)?.name || page.params.fam : page.params.fam
 	);
@@ -198,7 +199,7 @@
 		class="app-shell {bgPattern ? `pattern-${bgPattern}` : ''}"
 		style={`${bgSizeVw ? `--s:calc(${bgSizeVw} * 1vw);` : ''}--c1:${bgShades.c1};--c2:${bgShades.c2};--c3:${bgShades.c3};--c4:${bgShades.c4}`}
 	>
-		<Sidebar {famName} session={data.session} {isParent} {role} />
+		<Sidebar {famName} session={data.session} {isParent} {role} {isDemo} />
 		<TopNav
 			role={data.session ? role : ''}
 			seasons={famStore.seasons.filter((s) => s.active !== false)}