Summary: v0 adds File Explorer and Refactor Preview tools

Why It Matters: These new interface elements suggest the tool is moving toward a more complete coding environment. It helps users manage complex projects and see code changes more clearly.

What Changed:

• Added a File Explorer sidebar to help users navigate project files.
• Added a Refactor Preview section to show code improvements.
• Added a "Find in Files" search feature with keyboard shortcuts.
• Updated the template gallery with new featured items like "Tetris" and "Product Launch Waitlist."
• Updated engagement metrics (likes and forks) across several existing templates.