Greasy Fork镜像

Key Changes:
1. NO e.preventDefault() - Your native right-click menu works normally!
2. Floating menu appears alongside - A small blue box appears near your cursor 25px to the right
3. 150ms delay - Gives the native menu time to appear first
4. Smart positioning - If there's no room on the right, it appears on the left
5. Auto-hide after 8 seconds - Less intrusive
6. Close button - You can manually close it with the × button

What you'll see when you right-click an image:
• Your normal browser context menu with Copy Image, Save Image, etc.
• PLUS a small dark blue floating menu with "📸 Imgilism Upload" and the three size options
• Both menus work independently!