Fluent UI refactor

Highlights

This release ships the major Fluent UI refactor and a cleaner conversion-focused workflow.

Added

• New QFluentWidgets app shell with dedicated Home, Settings, and Help pages.
• Clear conversion flow states: queue -> converting -> results.
• Fluent icon-based actions and updated documentation/screenshots.

Improved

• Visual polish across the app:
  • Solarized-inspired light theme
  • Nord-inspired dark theme
  • Better contrast, spacing, typography, and section clarity
• Light-mode navigation/sidebar theming is now consistent.
• CI/release workflows updated for the current packaging pipeline.
• Better packaged startup behavior with onedir distribution. (startup down to sub 1 sec)

Removed / Simplified

• Removed autosave.
• Removed Document Intelligence settings from the main UX.
• Trimmed low-usage/legacy controls to keep the app focused.

Packaging (onedir)

Release artifacts are distributed as platform-specific .zip files containing a complete onedir app folder.

To run:

1. Download the .zip for your OS.
2. Unzip it.
3. Open the extracted folder.
4. Run the executable (MarkItDown.exe on Windows).

Keep the executable inside the extracted folder with its bundled files (do not move only the .exe).