start: show the normal site header on /start (with the owner dashboard button, highlighted there); no footer on the new-tab page

/start is no longer immersive, so it loads the lazily imported SiteChrome like other pages.
Only the book reader still skips the chrome. hidesFooter() keeps the footer off /start.

src/routes/+layout.ts

@@ -2,8 +2,8 @@ import { isImmersive } from '#lib/chrome.js';
 import type { LayoutLoad } from './$types';
 
 // The site header/footer (icon libraries, dropdowns, the bits-ui Sheet) live in SiteChrome,
-// imported only for pages that show them. Immersive pages such as the /start new-tab
-// dashboard never download that code. Universal loads may return components.
+// imported only for pages that show them. Immersive pages (the book reader) never
+// download that code. Universal loads may return components.
 export const load: LayoutLoad = async ({ data, url }) => ({
 	...data,
 	Chrome: isImmersive(url.pathname)