XMind Export and Smarter Outline Copying

✨ New Features

• Export mind maps to XMind format (.xmind) directly from the app (seamless workflow with external tools)
  Screenshot
  Screenshot

• Copy individual outline blocks via block menu (faster and more precise copying)
  Demo video

🛠 Fixes

• Fixed: XMind import now preserves branch IDs and correctly opens the created file (imported maps stay consistent and usable)
• Fixed: Copied outline markdown no longer contains unnecessary empty lines (cleaner pasted content)
  Screenshot

And other improvements