Smarter Transcription & Interface Polish Update

🛠 Fixes

• Fixed player button color on hover
• Fixed styles of the desktop file panel Screenshot
• Fixed translation for the left panel toggle to clearly indicate opening the mind map folder
• Fixed background color for the "New Mind Map" button and adjusted player container layout
• Reduced search throttle delay for faster search response
• Fixed data preparation for parent branch keyword creation during transcription

✨ New Features

• Improved dropdown dialogs for branches: now better positioned and sized
  Screenshot
  Demo video

And other improvements