Experimental Mode + File Browser Fixes

Hey Folks! Some fixes and improvements for you in this release!

• Added experimental mode toggle for enabling passthrough API support.
• Improved the handling of long file paths in the breadcrumb bar at the top.
• Fixed a bug when uploading files that meant if you navigated to another folder it would upload there instead.
• Improved the icons used on the file browser to make a bit more sense.
• Improved the new folder creation to submit the entry when the return key is pressed.
• Improved the "No files" message to also show the current path.
• Fixed the PC Download button to open the link in your default browser to download when in the desktop app.