Fix thumbnails and file previews on Linux (#635)

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* Fix thumbnails and file previews on Linux
 - Restructure auth_middleware to use axum's primitives to handle the auth tokens
 - Fix incorrect token loading in App.tsx
 - Add required dependencies for video playback to the Linux setup script
 - Minor improvements to the Linux setup script, make it less error prone
 - Fix a minor bug in the script_failure function in the Linux setup script

* Use a more idiomatic rust syntax in auth_middleware

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