feat: add assistant board styling tools

apps/nextjs/src/components/assistant/assistant-tool-contracts.spec.ts

@@ -1,4 +1,5 @@
 import { describe, expect, test } from "vitest";
+import { z } from "zod/v4";
 
 import { browserToolContracts, normalizeAssistantAppIconUrl } from "./assistant-tool-contracts";
 
@@ -34,6 +35,35 @@ describe("assistant human tool contracts", () => {
     ).toBe(true);
   });
 
+  test("accepts a scoped board settings proposal", () => {
+    expect(
+      browserToolContracts.configure_board_settings.parameters.safeParse({
+        boardId: "board-1",
+        boardName: "Home",
+        summary: "Improve dashboard contrast and tighten card spacing.",
+        changes: {
+          primaryColor: "#7C3AED",
+          customCss: ".mantine-Card-root { padding: 0.75rem; }",
+        },
+      }).success,
+    ).toBe(true);
+  });
+
+  test("rejects invalid board colors and oversized CSS", () => {
+    expect(
+      browserToolContracts.configure_board_settings.parameters.safeParse({
+        boardId: "board-1",
+        boardName: "Home",
+        summary: "Change styling",
+        changes: { primaryColor: "purple", customCss: "a".repeat(16_385) },
+      }).success,
+    ).toBe(false);
+  });
+
+  test("converts the board review parameters to a provider JSON schema", () => {
+    expect(() => z.toJSONSchema(browserToolContracts.configure_board_settings.parameters)).not.toThrow();
+  });
+
   test("only preserves usable app icon URLs", () => {
     expect(normalizeAssistantAppIconUrl("youtube")).toBe("");
     expect(normalizeAssistantAppIconUrl("/api/media/youtube.svg")).toBe("/api/media/youtube.svg");