💄 Update input styling for API key display

Enhance the appearance of the API key input and copy button for better usability.

💄 Enhance UI for recent activity and webhooks

Improve layout and add "View All" links for better navigation
in recent activity and webhooks sections.

✨ Introduce webhook management features

Add functionality for creating, viewing, and testing webhooks.
Implement database migrations for webhooks and invocations, along with
associated tests to ensure reliability and correctness.