fix(SEC-WEB-26+29): Remove console.log + fix formatTime error handling

- Remove debug console.log from workspaces page and teams page
- Fix formatTime to return "Invalid date" fallback instead of empty string
  when date parsing fails (handles both thrown errors and NaN dates)
- Export formatTime and add unit tests for error handling cases

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/components/chat/MessageList.tsx

@@ -313,12 +313,15 @@ function LoadingIndicator({ quip }: { quip?: string | null }): React.JSX.Element
   );
 }
 
-function formatTime(isoString: string): string {
+export function formatTime(isoString: string): string {
   try {
     const date = new Date(isoString);
+    if (isNaN(date.getTime())) {
+      return "Invalid date";
+    }
     return date.toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" });
   } catch {
-    return "";
+    return "Invalid date";
   }
 }