feat(usage): add toggle to hide prediction rows on usage cards (#1420)

* feat(usage): add showPredValues setting to quota store

* feat(usage): register usageShowPredValues in settings sanitizers

* feat(usage): add i18n key for show predictions toggle

* feat(usage): add show predictions toggle to sidebar

* feat(usage): hide pred row by default, gate on showPredValues

* fix(usage): gate header dropdown PaceIndicator behind showPredValues

* fix(usage): gate VSCodeLayout PaceIndicator behind showPredValues

* fix(usage): correct indentation drift in Header.tsx PaceIndicator blocks

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

@@ -912,6 +912,7 @@ export const settingsDict = {
   'settings.usage.sidebar.field.displayModePlaceholder': '표시 모드',
   'settings.usage.sidebar.field.displayModeUsage': '사용량',
   'settings.usage.sidebar.field.displayModeRemaining': '남은 할당량',
+  'settings.usage.sidebar.field.showPredictions': '예측 표시',
   'settings.usage.sidebar.status.notSet': '설정 안 됨',
   'settings.usage.page.empty.selectProvider': '사용량 세부 정보를 보려면 프로바이더를 선택하세요.',
   'settings.usage.page.header.providerUsage': '{provider} 사용량',