Implement unified catalog search with token-based filtering

- Add useCatalogSearch composable for managing unified search state
- Add UnifiedSearchBar component with token chips for filters
- Add CatalogHero component for empty/landing state
- Create grid components for each display mode:
  - CatalogGridProducts, CatalogGridSuppliers, CatalogGridHubs
  - CatalogGridHubsForProduct, CatalogGridProductsFromSupplier
  - CatalogGridProductsInHub, CatalogGridOffers
- Add unified catalog page at /catalog with query params
- Remove SubNavigation from catalog section (kept for other sections)
- Update all links to use new unified catalog paths
- Delete old nested catalog pages (offers/suppliers/hubs flows)
- Add i18n translations for catalog section

app/components/catalog/CatalogGridHubs.vue

@@ -0,0 +1,58 @@
+<template>
+  <div>
+    <Text size="lg" weight="semibold" class="mb-4">{{ t('catalog.headers.selectHub') }}</Text>
+
+    <div v-if="isLoading" class="flex justify-center py-12">
+      <span class="loading loading-spinner loading-lg"></span>
+    </div>
+
+    <div v-else-if="filteredItems.length === 0" class="text-center py-12">
+      <Text tone="muted">{{ t('catalog.empty.noHubs') }}</Text>
+    </div>
+
+    <div v-else class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-4">
+      <HubCard
+        v-for="hub in filteredItems"
+        :key="hub.uuid"
+        :hub="hub"
+        selectable
+        @select="$emit('select', { uuid: hub.uuid, name: hub.name })"
+      />
+    </div>
+
+    <PaginationLoadMore
+      v-if="filteredItems.length > 0 && canLoadMore"
+      :shown="filteredItems.length"
+      :total="total"
+      :can-load-more="canLoadMore"
+      :loading="isLoadingMore"
+      hide-counter
+      @load-more="loadMore"
+      class="mt-4"
+    />
+  </div>
+</template>
+
+<script setup lang="ts">
+const props = defineProps<{
+  searchQuery: string
+}>()
+
+const emit = defineEmits<{
+  (e: 'select', hub: { uuid: string; name: string }): void
+}>()
+
+const { t } = useI18n()
+const { items, total, isLoading, isLoadingMore, canLoadMore, loadMore, init } = useCatalogHubs()
+
+await init()
+
+const filteredItems = computed(() => {
+  if (!props.searchQuery.trim()) return items.value
+  const q = props.searchQuery.toLowerCase()
+  return items.value.filter((item: any) =>
+    item.name?.toLowerCase().includes(q) ||
+    item.country?.toLowerCase().includes(q)
+  )
+})
+</script>