Clearer playback navigation and stable offline AI in browser

🔄 Improvements

• Improved synchronization between mind map and outline, so selection and playback stay aligned
  Screenshot

• Stabilized outline rendering after opening or resizing panel, preventing jumping or broken item sizes
  Before
  After

• Improved slides upload feedback with accurate preview and smoother animation landing on “Next” button

• Cleaner UI in color and theme panels by removing unfinished or unnecessary elements
  Screenshot

• Breadcrumbs now look and behave like links, making navigation clearer
  Before
  After

✨ New Features

• Added browser-based offline AI (Gemma) with install and run directly in the browser
  Screenshot

🛠 Fixes

• Fixed: play mark now correctly switches between branches during playback, preventing stale highlights

• Fixed: play mark is cleared immediately when playback stops, improving visual clarity
  Before
  After

• Fixed: bookmark navigation restored, allowing quick jump to saved points

• Fixed: branch thickness updates immediately after settings change
  Before
  After

• Fixed: slides animation preview now shows correct content instead of broken attachments

And other improvements