[FEATURE] Agent-Specific UI for different Agent Actions

### 💡 Is your feature request related to a problem?
Sentient only returns text responses when tools finish executing. This is not ideal and most personal companions have specific UI components that show up for certain responses.

### ✨ Describe the Solution
A UI component needs to be added that shows the tool result to the user. In this case, a UI component that shows the event that has been added and details of the event like attendees, etc.

### 📌 Additional Context
You can refer to the existing implementation of the Search Inbox tool UI for the Gmail Agent in Sentient.

Here, responses from the Search Inbox tool show up on the frontend as follows: