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)/meal-plan/page.tsx

@@ -13,7 +13,7 @@ import { ExportMarkdownButton } from "@/components/shared/export-markdown-button
 import { mealPlanToMarkdown } from "@/lib/markdown/meal-plan";
 import { getMessages, formatMessage } from "@/lib/i18n/server";
 
-export const metadata: Metadata = { title: "Meal Plan" };
+export const metadata: Metadata = {};
 
 function getMonday(dateStr?: string): Date {
   const d = dateStr ? new Date(dateStr) : new Date();