Add Explore/Quote dual mode to catalog page

- Add CatalogMode type (explore/quote) to useCatalogSearch
- Create ExplorePanel component with view toggle (offers/hubs/suppliers)
- Create QuoteForm and QuotePanel components for search form
- Refactor CatalogPage to fullscreen map with overlay panel
- Simplify catalog/index.vue to use new components
- Add translations for modes and quote form (ru/en)

The catalog now has two modes:
- Explore: Browse map with offers/hubs/suppliers toggle
- Quote: Search form with product/hub/qty filters to find offers

i18n/locales/en/catalog.json

@@ -40,6 +40,23 @@
       "offers": "Offers",
       "map": "Map"
     },
+    "modes": {
+      "explore": "Explore",
+      "quote": "Get Quote"
+    },
+    "quote": {
+      "title": "Get Quote",
+      "selectProduct": "Select product",
+      "selectHub": "Select hub",
+      "selectSupplier": "Select supplier",
+      "enterQty": "Quantity (t)",
+      "search": "Search",
+      "clear": "Clear"
+    },
+    "explore": {
+      "title": "Explore the market",
+      "subtitle": "Switch between offers, hubs, and suppliers"
+    },
     "offers": "offer | offers"
   }
 }