Add icon path to empty commit webview panel

- Set git-commit icon for the webview panel tab
- Icon appears in both light and dark themes
- Uses codicons/git-commit.svg from resources

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

Author: Copilot

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

@@ -167,7 +167,14 @@ declare module 'vscode' {
 		constructor(value: ChatResponseDiffEntry[], title: string, readOnly?: boolean);
 	}
 
-	export type ExtendedChatResponsePart = ChatResponsePart | ChatResponseTextEditPart | ChatResponseNotebookEditPart | ChatResponseConfirmationPart | ChatResponseCodeCitationPart | ChatResponseReferencePart2 | ChatResponseMovePart | ChatResponseExtensionsPart | ChatResponsePullRequestPart | ChatPrepareToolInvocationPart | ChatToolInvocationPart | ChatResponseMultiDiffPart | ChatResponseThinkingProgressPart;
+	export class ChatResponseExternalEditPart {
+		uris: Uri[];
+		callback: () => Thenable<unknown>;
+		applied: Thenable<void>;
+		constructor(uris: Uri[], callback: () => Thenable<unknown>);
+	}
+
+	export type ExtendedChatResponsePart = ChatResponsePart | ChatResponseTextEditPart | ChatResponseNotebookEditPart | ChatResponseConfirmationPart | ChatResponseCodeCitationPart | ChatResponseReferencePart2 | ChatResponseMovePart | ChatResponseExtensionsPart | ChatResponsePullRequestPart | ChatPrepareToolInvocationPart | ChatToolInvocationPart | ChatResponseMultiDiffPart | ChatResponseThinkingProgressPart | ChatResponseExternalEditPart;
 	export class ChatResponseWarningPart {
 		value: MarkdownString;
 		constructor(value: string | MarkdownString);
@@ -301,6 +308,14 @@ declare module 'vscode' {
 
 		notebookEdit(target: Uri, isDone: true): void;
 
+		/**
+		 * Makes an external edit to one or more resources. Changes to the
+		 * resources made within the `callback` and before it resolves will be
+		 * tracked as agent edits. This can be used to track edits made from
+		 * external tools that don't generate simple {@link textEdit textEdits}.
+		 */
+		externalEdit<T>(target: Uri | Uri[], callback: () => Thenable<T>): Thenable<T>;
+
 		markdownWithVulnerabilities(value: string | MarkdownString, vulnerabilities: ChatVulnerability[]): void;
 		codeblockUri(uri: Uri, isEdit?: boolean): void;
 		push(part: ChatResponsePart | ChatResponseTextEditPart | ChatResponseWarningPart | ChatResponseProgressPart2): void;

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

@@ -87,6 +87,8 @@ declare module 'vscode' {
 		 * Events for edited files in this session collected since the last request.
 		 */
 		readonly editedFileEvents?: ChatRequestEditedFileEvent[];
+
+		readonly isSubagent?: boolean;
 	}
 
 	export enum ChatRequestEditedFileEventKind {

src/github/emptyCommitWebview.ts

@@ -4,6 +4,7 @@
  *--------------------------------------------------------------------------------------------*/
 
 import * as vscode from 'vscode';
+import { EXTENSION_ID } from '../constants';
 
 /**
  * Opens a webview panel to display a message for an empty commit.
@@ -20,6 +21,15 @@ export function showEmptyCommitWebview(commitSha: string): void {
 		}
 	);
 
+	// Set icon for the webview panel tab
+	const extensionUri = vscode.extensions.getExtension(EXTENSION_ID)?.extensionUri;
+	if (extensionUri) {
+		panel.iconPath = {
+			light: vscode.Uri.joinPath(extensionUri, 'resources', 'icons', 'codicons', 'git-commit.svg'),
+			dark: vscode.Uri.joinPath(extensionUri, 'resources', 'icons', 'codicons', 'git-commit.svg')
+		};
+	}
+
 	panel.webview.html = getEmptyCommitHtml();
 }