feat: homepage animations; Arabic as default locale

apps/web/app/i18n/t.ts

@@ -5,8 +5,8 @@
    plus {placeholder} interpolation. No i18next, no ICU MessageFormat - the
    catalogues hold UI chrome only, page prose comes from Strapi.
 
-   English is the reference catalogue: `Messages` is derived from en.json, and
-   ar.json is typechecked against it, so a key added on one side and forgotten
+   Arabic is the reference catalogue: `Messages` is derived from ar.json, and
+   en.json is typechecked against it, so a key added on one side and forgotten
    on the other is a compile error rather than a blank label in production.
    ========================================================================= */
 
@@ -15,8 +15,8 @@ import ar from "./messages/ar.json";
 
 import { DEFAULT_LOCALE, type Locale } from "./config";
 
-/** The shape of every catalogue. Derived from the English source of truth. */
-export type Messages = typeof en;
+/** The shape of every catalogue. Derived from the Arabic source of truth. */
+export type Messages = typeof ar;
 
 /** Anything that may be interpolated into a message. */
 export type TranslationParams = Readonly<
@@ -44,13 +44,13 @@ export type Translator = (
   params?: TranslationParams,
 ) => string;
 
-/* The `Messages` annotation is the parity check: ar.json must supply every
-   key en.json declares, with a string in every leaf position. */
-const arabicMessages: Messages = ar;
+/* The `Messages` annotation is the parity check: en.json must supply every
+   key ar.json declares, with a string in every leaf position. */
+const englishMessages: Messages = en;
 
 const CATALOGUES: Readonly<Record<Locale, Messages>> = {
-  en,
-  ar: arabicMessages,
+  en: englishMessages,
+  ar,
 };
 
 /** The whole catalogue for a locale - handy for spreading into a component. */
@@ -90,7 +90,7 @@ export function interpolate(
 }
 
 /**
- * Translate one key. Falls back to the English string when a locale is
+ * Translate one key. Falls back to the default-locale string when a locale is
  * missing it, and finally to the key itself so a page never renders "".
  */
 export function translate(