Bug : UIKit contextual bars not rendering in EmbeddedChat

Description:

UIKit contextual bars fail to open when triggered by slash commands in EmbeddedChat. The command executes without errors but the contextual bar UI never appears, making Apps that rely on this feature completely unusable.

Steps to reproduce:

1. Install a Rocket.Chat apps that uses contextual bars (e.g., Apps.QuickReplies)
2. Open EmbeddedChat
3. Execute a slash command that should open a contextual bar (e.g., /quick list)
4. Expected: Contextual bar opens in the sidebar
5. Actual: Nothing happens - fails silently with no error messages

Expected behavior:

When a slash command triggers a UIKit contextual bar:

• The sidebar should open
• The contextual bar UI should render properly
• Users should be able to interact with the UI elements

Actual behavior:

• Command appears to execute (no error shown)
• Sidebar remains closed
• Contextual bar never renders

https://github.com/user-attachments/assets/0047b810-5fab-418f-8c11-05c2349af67f

Start by reproducing the slash-command flow in EmbeddedChat with a UIKit contextual bar such as Apps.QuickReplies, then trace how the command reaches the sidebar and contextual bar UI. Done means the sidebar opens, the contextual bar renders, and its UI elements are interactive without errors.