Add markdown hover support to notification tree items (#7322)

* Initial plan

* Initial analysis and build setup

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

* Add resolveTreeItem method to NotificationsManager for markdown hover support

* Naming

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: alexr00 <38270282+alexr00@users.noreply.github.com>

Author: Copilot

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

@@ -258,6 +258,13 @@ declare module 'vscode' {
 		readonly tools: Map<string, boolean>;
 	}
 
+	export namespace lm {
+		/**
+		 * Fired when the set of tools on a chat request changes.
+		 */
+		export const onDidChangeChatRequestTools: Event<ChatRequest>;
+	}
+
 	// TODO@API fit this into the stream
 	export interface ChatUsedContext {
 		documents: ChatDocumentContext[];

src/extension.ts

@@ -227,7 +227,7 @@ async function init(
 	context.subscriptions.push(issuesFeatures);
 	await issuesFeatures.initialize();
 
-	const notificationsFeatures = new NotificationsFeatureRegister(credentialStore, reposManager, telemetry);
+	const notificationsFeatures = new NotificationsFeatureRegister(credentialStore, reposManager, telemetry, context);
 	context.subscriptions.push(notificationsFeatures);
 
 	context.subscriptions.push(new GitLensIntegration());

src/notifications/notificationsFeatureRegistar.ts

@@ -22,13 +22,14 @@ export class NotificationsFeatureRegister extends Disposable {
 	constructor(
 		readonly credentialStore: CredentialStore,
 		private readonly _repositoriesManager: RepositoriesManager,
-		private readonly _telemetry: ITelemetry
+		private readonly _telemetry: ITelemetry,
+		private readonly _context: vscode.ExtensionContext
 	) {
 		super();
 		const notificationsProvider = new NotificationsProvider(credentialStore, this._repositoriesManager);
 		this._register(notificationsProvider);
 
-		const notificationsManager = new NotificationsManager(notificationsProvider, credentialStore);
+		const notificationsManager = new NotificationsManager(notificationsProvider, credentialStore, this._repositoriesManager, this._context);
 		this._register(notificationsManager);
 
 		// Decorations