workbench: align chat pill dropdown actions

Scope the Agents-style trailing alignment to shared chat pill rows with toolbar actions, while preserving base ActionList spacing for rows without actions or with structured content.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: chryw

src/vs/workbench/browser/chatDropdownPill.ts

@@ -298,7 +298,7 @@ export class ChatDropdownPillActionViewItem extends ChatPillActionViewItem {
 				getAriaLabel: item => item.label ?? '',
 				getWidgetAriaLabel: () => this._pillOptions.title,
 			},
-			{ minWidth: 240, maxWidth: 460, widgetClassName: 'show-file-icons' },
+			{ minWidth: 240, maxWidth: 460, widgetClassName: 'show-file-icons chat-pill-dropdown' },
 		);
 	}
 

src/vs/workbench/browser/media/chatPills.css

@@ -169,6 +169,14 @@
 	background-position: center center;
 }
 
+.action-widget.chat-pill-dropdown .monaco-list .monaco-list-row.has-toolbar:not(.has-standalone-toggle):not(.has-inline-toggle):not(.has-detail) {
+	padding-right: 0;
+}
+
+.action-widget.chat-pill-dropdown .monaco-list .monaco-list-row.has-toolbar:not(.has-standalone-toggle):not(.has-inline-toggle):not(.has-detail) .action-list-item-toolbar {
+	margin-right: 0;
+}
+
 /* Horizontally scrollable status pills above a chat input. */
 .chat-pills-row {
 	width: 100%;