Load GraphQL schema from file for autocomplete (#462)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-authored-by: Gregory Schier <gschier1990@gmail.com>

apps/yaak-client/hooks/useGraphQLSchemaFile.ts

@@ -0,0 +1,18 @@
+import { useKeyValue } from "./useKeyValue";
+
+// The file a request's GraphQL schema is loaded from, or null when the schema
+// comes from an introspection request.
+//
+// This is the *source*, not the schema. The introspection row it produces is a
+// cache that expires on its own; this outlives it and regenerates it, the same
+// way gRPC keeps its proto file list separate from a reflection result.
+export function graphqlSchemaFileArgs(requestId: string | null) {
+  return {
+    namespace: "global" as const,
+    key: ["graphql_schema_file", requestId ?? "n/a"],
+  };
+}
+
+export function useGraphQLSchemaFile(requestId: string | null) {
+  return useKeyValue<string | null>({ ...graphqlSchemaFileArgs(requestId), fallback: null });
+}