fix(i18n/de): address code review findings

- Remove broken `import type { I18nDictionary } from '../types'` from
  de.ts and de.settings.ts; match the untyped style of fr.ts/fr.settings.ts
- Add `de`/`de-*` case to normalizeLocale() in runtime.ts so browser
  locale auto-detection picks up German without manual Settings change
- Fix ternary indentation in store.ts to match surrounding pl/ja branches

packages/ui/src/lib/i18n/messages/de.settings.ts

@@ -1,6 +1,4 @@
-import type { I18nDictionary } from '../types';
-
-export const settingsDict: Partial<I18nDictionary> = {
+export const settingsDict = {
   'settings.providers.page.openCodeGo.title': 'OpenCode Go Nutzungsverfolgung',
   'settings.providers.page.openCodeGo.description': 'Verbinden Sie das OpenCode Go Dashboard, um rollierenden, wöchentlichen und monatlichen Verbrauch anzuzeigen.',
   'settings.providers.page.openCodeGo.workspaceId': 'Workspace-ID',

packages/ui/src/lib/i18n/messages/de.ts

@@ -1,7 +1,6 @@
 import { settingsDict } from './de.settings';
-import type { I18nDictionary } from '../types';
 
-export const dict: Partial<I18nDictionary> = {
+export const dict = {
   ...settingsDict,
   'common.language.german': 'Deutsch',
   'chat.message.userText.collapseAria': 'Benutzer-Nachricht einklappen',