Summary: Turbo AI adds direct PDF drag-and-drop to homepage

Why It Matters: The website now lets users start the core task immediately. Removing the "Proofreading your notes..." loading text in favor of a file uploader makes the tool feel faster and more ready to use.

What Changed:

• Replaced a loading status message ("75% Proofreading your notes...") with a functional file upload area.
• Added a specific example file name ("Lec 5: Cellular Bio.pdf") to the hero section.
• Added a "Drop your PDF here" call to action in the main header.
• Moved the "Testimonials" section further down the page, below the FAQ.