Closes #198.

I just assumed this was on by default 😭

In fact, the documentation says it is, but it's very clearly not!
```
/**
 `NSSavePanel`/`NSOpenPanel`: Set to `YES` to show the "New Folder" button. Default is `YES`.
 */
open var canCreateDirectories: Bool
```

Also configures the linter to pick up on unused arguments, and configures the formatter to not format them out (by setting them to _). If this was the case prior, this bug wouldn't have happened.

I undid the work of #114 in #158, by disabling the VPN toggle when the network extension was unconfigured.
When signed out, the network extension is unconfigured.
This PR adds a special exception to make the VPN toggle always clickable when signed out, as it has special behaviour when signed out.
It also adds a proper regression test. A slightly different regression test existed, but it didn't account for cases where the VPN state is one that would normally disable the toggle.

#207)

Prevents scenarios like the following, where newlines are pasted in by accident:

<img width="555" height="246" alt="image" src="https://github.com/user-attachments/assets/5f473dd4-dc11-4a28-a3b2-9e7bc57d033f" />

The Windows app has trimming in the same places.

Closes #188.

If the workspaces view exceeds 400px in height, it'll become scrollable. The diff without whitespace changes is like 4 lines.

https://github.com/user-attachments/assets/5bdd0369-c882-4085-9513-7594bd100475


I think the `View more`/`View less` very much still makes sense, so I'm keeping it.