chore: move resolveCdpElementId (#1923)

This is a refactoring, a follow-up to the introduction of `McpPage.ts`.

Author: wolfib

src/McpContext.ts

@@ -178,33 +178,6 @@ export class McpContext implements Context {
     return this.#networkCollector.getIdForResource(request);
   }
 
-  resolveCdpElementId(
-    page: McpPage,
-    cdpBackendNodeId: number,
-  ): string | undefined {
-    if (!cdpBackendNodeId) {
-      this.logger('no cdpBackendNodeId');
-      return;
-    }
-    const snapshot = page.textSnapshot;
-    if (!snapshot) {
-      this.logger('no text snapshot');
-      return;
-    }
-    // TODO: index by backendNodeId instead.
-    const queue = [snapshot.root];
-    while (queue.length) {
-      const current = queue.pop()!;
-      if (current.backendNodeId === cdpBackendNodeId) {
-        return current.id;
-      }
-      for (const child of current.children) {
-        queue.push(child);
-      }
-    }
-    return;
-  }
-
   getNetworkRequests(
     page: McpPage,
     includePreservedRequests?: boolean,
@@ -782,8 +755,7 @@ export class McpContext implements Context {
     const data = devtoolsData ?? (await this.getDevToolsData(page));
     if (data?.cdpBackendNodeId) {
       snapshot.hasSelectedElement = true;
-      snapshot.selectedElementUid = this.resolveCdpElementId(
-        page,
+      snapshot.selectedElementUid = page.resolveCdpElementId(
         data?.cdpBackendNodeId,
       );
     }

src/McpPage.ts

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+import {logger} from './logger.js';
 import type {
   Dialog,
   ElementHandle,
@@ -164,4 +165,28 @@ export class McpPage implements ContextPage {
   getAXNodeByUid(uid: string) {
     return this.textSnapshot?.idToNode.get(uid);
   }
+
+  resolveCdpElementId(cdpBackendNodeId: number): string | undefined {
+    if (!cdpBackendNodeId) {
+      logger('no cdpBackendNodeId');
+      return;
+    }
+    const snapshot = this.textSnapshot;
+    if (!snapshot) {
+      logger('no text snapshot');
+      return;
+    }
+    // TODO: index by backendNodeId instead.
+    const queue = [snapshot.root];
+    while (queue.length) {
+      const current = queue.pop()!;
+      if (current.backendNodeId === cdpBackendNodeId) {
+        return current.id;
+      }
+      for (const child of current.children) {
+        queue.push(child);
+      }
+    }
+    return;
+  }
 }

src/McpResponse.ts

@@ -513,10 +513,7 @@ export class McpResponse implements Response {
             context,
             this.#page,
           ),
-          elementIdResolver: context.resolveCdpElementId.bind(
-            context,
-            this.#page,
-          ),
+          elementIdResolver: this.#page.resolveCdpElementId.bind(this.#page),
         });
         if (!formatter.isValid()) {
           throw new Error(