Redesign header - move search bar into main navigation

- Move search input with tokens into center of header
- Remove tabs (Search, Catalog, Orders, Seller)
- Icons (bot, globe, user) remain on right side
- Chips for filter selection below input
- Delete GlobalSearchBar.vue and UnifiedSearchBar.vue
- Share searchQuery via useState across composable calls
- Simplify main page to just show hero

app/pages/catalog/index.vue

@@ -13,20 +13,6 @@
     @select="onMapSelect"
     @update:hovered-id="hoveredId = $event"
   >
-    <template #searchBar>
-      <UnifiedSearchBar
-        :active-tokens="activeTokens"
-        :available-chips="availableChips"
-        :select-mode="selectMode"
-        :search-query="searchQuery"
-        @start-select="startSelect"
-        @cancel-select="cancelSelect"
-        @edit-token="editFilter"
-        @remove-token="removeFilter"
-        @update:search-query="searchQuery = $event"
-      />
-    </template>
-
     <template #header>
       <Text v-if="!isLoading" tone="muted">{{ headerText }}</Text>
     </template>