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/(app)/recipes/can-cook/page.tsx

@@ -6,7 +6,7 @@ import { eq } from "@epicure/db";
 import { getPublicUrl } from "@/lib/storage";
 import { CanCookContent } from "@/components/recipe/can-cook-content";
 
-export const metadata: Metadata = { title: "What can I cook?" };
+export const metadata: Metadata = {};
 
 const EXPIRING_WITHIN_DAYS = 3;