fix: make pageId required (#2084)

Refs: #2052

Co-authored-by: Samiya Caur <samiyac@chromium.org>

Author: samiyac

src/tools/ToolDefinition.ts

@@ -365,7 +365,7 @@ export const CLOSE_PAGE_ERROR =
   'The last open page cannot be closed. It is fine to keep it open.';
 
 export const pageIdSchema = {
-  pageId: zod.number().optional().describe('Targets a specific page by ID.'),
+  pageId: zod.number().describe('Targets a specific page by ID.'),
 };
 
 export const timeoutSchema = {