refactor(admin-web): drop eyebrow labels from page heroes

Remove the redundant eyebrow text above page titles in PageHero,
BrandsView and TrackingView, and clean up the now-unused i18n keys.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/admin-web/src/views/BrandsView.vue

@@ -499,7 +499,6 @@ async function submitCompetitor(): Promise<void> {
     <section class="brands-view__top-card">
       <div class="brands-view__header">
         <div class="brands-view__header-title">
-          <p class="eyebrow" style="margin-bottom: 4px;">{{ t('brands.eyebrow') }}</p>
           <h2>{{ t('brands.title') }}</h2>
           <p>{{ t('brands.description') }}</p>
         </div>

apps/admin-web/src/views/TrackingView.vue

@@ -753,7 +753,6 @@ function disableTrackingDate(current: dayjs.Dayjs): boolean {
 <template>
   <section class="tracking-view">
     <PageHero
-      :eyebrow="t('tracking.eyebrow')"
       :title="t('route.tracking.title')"
       :description="heroDescription"
     >