Move constant to shared constants file to avoid duplication

Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

Author: Copilot

webviews/common/constants.ts

@@ -0,0 +1,10 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+/**
+ * Key for tracking comment textarea focus state in sessionStorage.
+ * Used to restore focus when the PR description webview regains focus.
+ */
+export const COMMENT_TEXTAREA_FOCUS_KEY = 'comment-textarea-had-focus';

webviews/common/context.tsx

@@ -5,17 +5,14 @@
 
 import { createContext } from 'react';
 import { getState, setState, updateState } from './cache';
+import { COMMENT_TEXTAREA_FOCUS_KEY } from './constants';
 import { getMessageHandler, MessageHandler } from './message';
 import { CloseResult, OpenCommitChangesArgs } from '../../common/views';
 import { IComment } from '../../src/common/comment';
 import { EventType, ReviewEvent, SessionLinkInfo, TimelineEvent } from '../../src/common/timelineEvent';
 import { IProjectItem, MergeMethod, ReadyForReview } from '../../src/github/interface';
 import { CancelCodingAgentReply, ChangeAssigneesReply, DeleteReviewResult, MergeArguments, MergeResult, ProjectItemsReply, PullRequest, ReadyForReviewReply, SubmitReviewReply } from '../../src/github/views';
 
-// Key for tracking comment textarea focus state in sessionStorage
-// Also used in webviews/editorWebview/app.tsx
-const COMMENT_TEXTAREA_FOCUS_KEY = 'comment-textarea-had-focus';
-
 export class PRContext {
 	constructor(
 		public pr: PullRequest | undefined = getState(),

webviews/editorWebview/app.tsx

@@ -8,12 +8,9 @@ import React, { useContext, useEffect, useState } from 'react';
 import { render } from 'react-dom';
 import { Overview } from './overview';
 import { PullRequest } from '../../src/github/views';
+import { COMMENT_TEXTAREA_FOCUS_KEY } from '../common/constants';
 import PullRequestContext from '../common/context';
 
-// Key for tracking comment textarea focus state in sessionStorage
-// Also used in webviews/common/context.tsx
-const COMMENT_TEXTAREA_FOCUS_KEY = 'comment-textarea-had-focus';
-
 export function main() {
 	render(<Root>{pr => <Overview {...pr} />}</Root>, document.getElementById('app'));
 }