What does this PR do?

Redesigns the AI tab in the piece selector with a modern two-column layout, featuring a prominent “AI Agent” card and a list of AI actions. Updates include animated video icons, hover-based playback for the main agent card, and refined styling with gradient backgrounds.

Explain How the Feature Works

New Layout: Split view with a large featured “AI Agent” card (left) and a list of other AI actions (right).
Animated Icons: Replaced static images with .mp4 videos; the AI Agent icon animates on hover.
Styling: Applied premium gradients (purple/pink for Agent, beige/amber for actions) and renamed the tab to “Activepieces AI”.

Relevant User Scenarios

Highlighting AI Agents: Users clearly see the AI Agent as the primary feature.
Enhanced Discovery: Animated icons make browsing AI actions more engaging and intuitive.

Fixes #10618 /claim #10618