fix: address Copilot review round 40 — a required name counts as a field

A schema may require a property it never declares: `{ type: "object",
required: ["token"] }` is legal and the tool plainly takes an argument.
declaresAnyFields counted only `properties`, so an App tool shaped that way —
including nested under a composition — was reported input-free and
auto-invoked with `{}`.

Signed-off-by: cliffhall <cliff@futurescale.com>

clients/web/src/utils/toolUtils.test.ts

@@ -145,6 +145,12 @@ describe("hasInputFields with root composition (#2123)", () => {
     ).toBe(true);
   });
 
+  it("counts a required name the schema never declares", () => {
+    expect(hasInputFields(tool({ type: "object", required: ["token"] }))).toBe(
+      true,
+    );
+  });
+
   it("still reports no fields for a bare object schema", () => {
     expect(hasInputFields(tool({ type: "object" }))).toBe(false);
   });