Screenshot Capture Tool (backend/screenshot.ts)

Defines a tab tool that captures page or element screenshots, inferring image format (png/jpeg/webp) from filename and returning formatted results.

// Source: https://github.com/microsoft/playwright | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
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/**
 * Copyright (c) Microsoft Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the L

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