sitesmith: publish home page to index.html, not home.html

replaceAllPages was slugifying every page name including the first, so
the home page landed at home.html. Apache resolves '/' to index.html, so
the published root URL appeared blank while the actual content was at
/home.html. First page now hard-codes slug='index'.

craft/src/state/PageContext.tsx

@@ -408,7 +408,10 @@ export const PageProvider: React.FC<{ children: ReactNode }> = ({ children }) =>
     const built = newPages.map((p, i) => ({
       id: i === 0 ? 'home' : `page_${Date.now()}_${i}`,
       name: p.name,
-      slug: slugify(p.name),
+      // First page must publish to index.html so it serves at the site root.
+      // Apache resolves '/' to index.html, not home.html — without this, the
+      // AI's "Home" page lands at /home.html and visitors hit a blank root.
+      slug: i === 0 ? 'index' : slugify(p.name),
       craftState: treeToState(p.tree),
       headCode: '',
     }));