refactor: remove all any types, add strict GraphQL scalar typing

- Add strictScalars: true to codegen.ts with proper scalar mappings
  (Date, Decimal, JSONString, JSON, UUID, BigInt → string/Record)
- Replace all ref<any[]> with proper GraphQL-derived types
- Add type guards for null filtering in arrays
- Fix bugs exposed by typing (locationLatitude vs latitude, etc.)
- Add interfaces for external components (MapboxSearchBox)

This enables end-to-end type safety from GraphQL schema to frontend.

app/pages/clientarea/offers/new.vue

@@ -26,8 +26,8 @@
     <template v-else>
       <Grid v-if="products.length" :cols="1" :md="2" :lg="3" :gap="4">
         <Card
-          v-for="product in products"
-          :key="product.uuid"
+          v-for="(product, index) in products"
+          :key="product.uuid ?? index"
           padding="lg"
           class="cursor-pointer hover:shadow-md transition-shadow"
           @click="selectProduct(product)"
@@ -51,7 +51,9 @@
 </template>
 
 <script setup lang="ts">
-import { GetProductsDocument } from '~/composables/graphql/public/exchange-generated'
+import { GetProductsDocument, type GetProductsQueryResult } from '~/composables/graphql/public/exchange-generated'
+
+type Product = NonNullable<NonNullable<GetProductsQueryResult['getProducts']>[number]>
 
 definePageMeta({
   layout: 'topnav',
@@ -62,7 +64,7 @@ const localePath = useLocalePath()
 const { t } = useI18n()
 const { execute } = useGraphQL()
 
-const products = ref<any[]>([])
+const products = ref<Product[]>([])
 const isLoading = ref(true)
 const hasError = ref(false)
 const error = ref('')
@@ -73,19 +75,19 @@ const loadProducts = async () => {
     hasError.value = false
     const { data, error: productsError } = await useServerQuery('offers-new-products', GetProductsDocument, {}, 'public', 'exchange')
     if (productsError.value) throw productsError.value
-    products.value = data.value?.getProducts || []
-  } catch (err: any) {
+    products.value = (data.value?.getProducts || []).filter((p): p is Product => p !== null)
+  } catch (err: unknown) {
     hasError.value = true
-    error.value = err.message || t('offersNew.errors.load_failed')
+    error.value = err instanceof Error ? err.message : t('offersNew.errors.load_failed')
     products.value = []
   } finally {
     isLoading.value = false
   }
 }
 
-const selectProduct = (product: any) => {
+const selectProduct = (product: { uuid?: string | null }) => {
   // Navigate to product details page
-  navigateTo(localePath(`/clientarea/offers/${product.uuid}`))
+  if (product.uuid) navigateTo(localePath(`/clientarea/offers/${product.uuid}`))
 }
 
 await loadProducts()