First commit

frontend/app/plugins/auth.ts

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+/* The wiki is open to readers, but writing takes an account, and the page must
+   know which side of that line it is on before it draws anything: the sidebar's
+   account row and the editor's sign-in gate are both part of the first render,
+   on the server as much as in the browser. So a stored session is checked here,
+   once, before any page runs. With no cookie in the request it costs nothing. */
+export default defineNuxtPlugin(async () => {
+  const { user, restoreSession } = useAuth()
+  await restoreSession()
+
+  /* The account's interface language outranks the device's own — the choice
+     follows the person — so the very first render speaks it. (setLocale keeps
+     the detection cookie in step, so the next load starts there even before
+     this runs.) */
+  if (user.value?.locale) await useAppLocale().applyAccount(user.value.locale)
+})