Use empty messages in init.ts to avoid dependency on compiled catalogs

Pre-initialization only needs to activate a locale, not load real messages.
App.tsx loads the real English catalog via i18n.loadAndActivate() in useEffect,
and since module-level t calls execute lazily from builder functions (called
in useMemo), they'll use the real messages.

This eliminates the hard dependency on compiled messages.mjs, allowing dev
workflows (pnpm dev, tests, fresh clones) to work without requiring
locale:compile to run first.

Bundle size: init.js reduced from 5.26 kB to 0.77 kB.

Author: ophirbucai

packages/admin/src/locales/init.ts

@@ -8,12 +8,14 @@
  * This ensures i18n is initialized before any module-level t`...` calls
  * execute, regardless of Astro's island hydration order.
  *
+ * We activate with empty messages here; App.tsx will load the real catalog
+ * synchronously during render (via useRef). Since t`...` calls in builder
+ * functions execute lazily (from useMemo), they'll use the real messages.
+ *
  * Side-effect import - modifies global i18n instance.
  */
 import { i18n } from "@lingui/core";
 
-import { messages } from "./en/messages.mjs";
-
 if (!i18n.locale) {
-	i18n.loadAndActivate({ locale: "en", messages });
+	i18n.loadAndActivate({ locale: "en", messages: {} });
 }