Summary: v0 adds File Explorer and Refactor Preview tools

Why It Matters: The product is moving from a simple chat interface to a more complete coding environment. These new features help users manage complex files and see code changes more clearly.

What Changed:

• Added a File Explorer section to the interface for managing project files.
• Added a Refactor Preview tool to show code improvements.
• Added a "Find in Files" search feature with a keyboard shortcut (⇧⌘F).
• Updated the template gallery with new featured projects like "Prompting Is All You Need" and "Restaurant POS."
• Updated the usage counts and "likes" for several existing community templates.