Hide review button when chat plan is collapsed (#311352)

Author: DonJayamanne

src/vs/workbench/contrib/chat/browser/widget/chatContentParts/chatPlanReviewPart.ts

@@ -337,6 +337,7 @@ export class ChatPlanReviewPart extends Disposable implements IChatContentPart {
 
 	private updateCollapsedPresentation(): void {
 		this.domNode.classList.toggle('chat-plan-review-collapsed', this._isCollapsed);
+		this._restoreButton.element.classList.toggle('chat-plan-review-hidden', this._isCollapsed);
 		this._collapseButton.label = this._isCollapsed
 			? `$(${Codicon.chevronDown.id})`
 			: `$(${Codicon.chevronUp.id})`;

src/vs/workbench/contrib/chat/browser/widget/chatContentParts/media/chatPlanReview.css

@@ -234,6 +234,11 @@
 	width: auto;
 }
 
+/* ---------- Hidden helper ---------- */
+.interactive-session .chat-plan-review-container .monaco-button.chat-plan-review-hidden {
+	display: none;
+}
+
 /* ---------- Collapsed state ---------- */
 .interactive-session .chat-plan-review-container.chat-plan-review-collapsed > .chat-confirmation-widget2.chat-plan-review > .chat-confirmation-widget-message-scrollable,
 .interactive-session .chat-plan-review-container.chat-plan-review-collapsed > .chat-confirmation-widget2.chat-plan-review > .chat-plan-review-feedback,