sessions: animate active sidebar chat spinner (#311440)

sessions: animate active sidebar chat icons

Render the existing spinning loading icon for in-progress sessions in the sidebar list so active chats match the rest of the sessions app.

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

Author: hawkticehurst

src/vs/sessions/contrib/sessions/browser/views/sessionsList.ts

@@ -457,7 +457,7 @@ class SessionItemRenderer implements ITreeRenderer<SessionListItem, FuzzyScore,
 
 	private getStatusIcon(status: SessionStatus, isRead: boolean, isArchived: boolean, pullRequestIcon?: ThemeIcon): ThemeIcon {
 		switch (status) {
-			case SessionStatus.InProgress: return { ...Codicon.sessionInProgress, color: themeColorFromId('textLink.foreground') };
+			case SessionStatus.InProgress: return { ...ThemeIcon.modify(Codicon.loading, 'spin'), color: themeColorFromId('textLink.foreground') };
 			case SessionStatus.NeedsInput: return { ...Codicon.circleFilled, color: themeColorFromId('list.warningForeground') };
 			case SessionStatus.Error: return { ...Codicon.error, color: themeColorFromId('errorForeground') };
 			default: