fix: localize skin site UI and renew JWT on startup

Catalog missing skin-site messages and check source IDs during i18n validation. Renew the saved JWT before loading session data, guard overlapping login/logout requests, and reload announcements after authentication with a retry action.

scripts/axolotl/skin-site-i18n.test.mjs

@@ -0,0 +1,36 @@
+import assert from 'node:assert/strict'
+import fs from 'node:fs'
+import test from 'node:test'
+
+import { collectSkinSiteMessages } from './skin-site-messages.mjs'
+
+test('all skin-site messages used in source exist in both release language catalogs', () => {
+	const messages = collectSkinSiteMessages()
+	assert.ok(messages.length > 100, 'The check must scan the actual UI')
+	for (const locale of ['en-US', 'zh-CN']) {
+		const catalog = JSON.parse(
+			fs.readFileSync(`apps/app-frontend/src/locales/${locale}/index.json`, 'utf8'),
+		)
+		const missing = messages.filter(({ id }) => !catalog[id]?.message)
+		assert.deepEqual(
+			missing.map(({ id }) => id),
+			[],
+			`${locale} has uncatalogued UI messages`,
+		)
+	}
+})
+
+test('Chinese login and announcement labels do not fall back to English', () => {
+	const catalog = JSON.parse(
+		fs.readFileSync('apps/app-frontend/src/locales/zh-CN/index.json', 'utf8'),
+	)
+	for (const id of [
+		'app.skin-site.login.title',
+		'app.skin-site.login.username',
+		'app.skin-site.login.password-hint',
+		'app.skin-site.home.announcements.title',
+		'app.skin-site.home.announcements.failed',
+	]) {
+		assert.match(catalog[id]?.message ?? '', /\p{Script=Han}/u, id)
+	}
+})