Address code review feedback - add constant for sessionStorage key and improve comments

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

Author: Copilot

src/@types/vscode.proposed.chatParticipantAdditions.d.ts

@@ -105,7 +105,6 @@ declare module 'vscode' {
 		isComplete?: boolean;
 		toolSpecificData?: ChatTerminalToolInvocationData;
 		fromSubAgent?: boolean;
-		presentation?: 'hidden' | 'hiddenAfterComplete' | undefined;
 
 		constructor(toolName: string, toolCallId: string, isError?: boolean);
 	}

webviews/common/context.tsx

@@ -12,6 +12,10 @@ import { EventType, ReviewEvent, SessionLinkInfo, TimelineEvent } from '../../sr
 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(),
@@ -415,7 +419,7 @@ export class PRContext {
 				const commentTextarea = document.getElementById('comment-textarea');
 				if (commentTextarea instanceof HTMLTextAreaElement) {
 					// Check if there's a stored focus state
-					const shouldRestoreFocus = sessionStorage.getItem('comment-textarea-had-focus') === 'true';
+					const shouldRestoreFocus = sessionStorage.getItem(COMMENT_TEXTAREA_FOCUS_KEY) === 'true';
 					if (shouldRestoreFocus) {
 						commentTextarea.focus();
 					}

webviews/editorWebview/app.tsx

@@ -10,6 +10,10 @@ import { Overview } from './overview';
 import { PullRequest } from '../../src/github/views';
 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'));
 }
@@ -26,16 +30,16 @@ export function Root({ children }) {
 	useEffect(() => {
 		const handleFocusIn = (e: FocusEvent) => {
 			if (e.target instanceof HTMLTextAreaElement && e.target.id === 'comment-textarea') {
-				sessionStorage.setItem('comment-textarea-had-focus', 'true');
+				sessionStorage.setItem(COMMENT_TEXTAREA_FOCUS_KEY, 'true');
 			}
 		};
 
 		const handleFocusOut = (e: FocusEvent) => {
 			if (e.target instanceof HTMLTextAreaElement && e.target.id === 'comment-textarea') {
-				// Only clear the flag if we're switching to a non-textarea element
-				// This prevents clearing when the webview loses focus
+				// Only clear the flag if we're switching to another element within the webview
+				// When switching to another editor group, relatedTarget will be null and we want to keep the flag
 				if (e.relatedTarget instanceof HTMLElement) {
-					sessionStorage.setItem('comment-textarea-had-focus', 'false');
+					sessionStorage.setItem(COMMENT_TEXTAREA_FOCUS_KEY, 'false');
 				}
 			}
 		};