fix: browser tab title should always just say "Epicure"

Root layout used title.template ("%s | Epicure") and 38 pages set
their own title, producing "Recipes | Epicure", "Messages — Epicure",
etc. Drop the template, set a flat "Epicure" default, and clear every
page's title override so they all inherit it.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/app/layout.tsx

@@ -19,7 +19,7 @@ const geistMono = Geist_Mono({
 });
 
 export const metadata: Metadata = {
-  title: { default: "Epicure", template: "%s | Epicure" },
+  title: "Epicure",
   description: "Your personal AI-powered recipe book.",
   manifest: "/manifest.json",
 };