[Feature Request] external drive auto-mount toggle

Currently, the ["beginner friendly" mount guide](https://wiki.cachyos.org/configuration/automount_with_fstab/#tldr) expects the user to create a systemd unit. While it's a trivial task for people with some linux experience, it's rather cumbersome for non-techies jumping into linux. Hence sharing this after witnessing a friend struggle with this while setting this up.

It would be nice to have an "Auto-Mount Drive" under "Apps/Tweaks". Does the same thing as mentioned in the guide, just automated and one-click. UI can be a simple drive list with toggles, and maybe we can give an option to create mount config through a systemd unit or directly edit fstab.

@ptr1337 Thoughts? I'm willing to contribute to this - but wanted to cross check with the you and the team before :)

Start with the linked automount guide, then locate the Apps/Tweaks entry point in CachyOS-Welcome. Clarify whether the feature should create a systemd unit, edit fstab, or support both, and define the drive-list toggle behavior before implementation. Done means users can select external drives and enable automatic mounting through the UI.

Written by the indexing model from the issue text.