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.

codegen.ts

@@ -9,8 +9,15 @@ const plugins = [
 const pluginConfig = {
   scalars: {
     DateTime: 'string',
+    Date: 'string',
+    Decimal: 'string',
+    JSONString: 'Record<string, unknown>',
+    JSON: 'Record<string, unknown>',
+    UUID: 'string',
+    BigInt: 'string',
   },
   useTypeImports: true,
+  strictScalars: true,
   // Add suffix to operation result types to avoid conflicts with schema types
   operationResultSuffix: 'Result',
 }