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="/api/flow.js?q=https%3A%2F%2Fgithub.com%2Fcoder%2Fcoder-desktop-macos%2Fcompare%2F%253Ca%2520href%3D"https://github.com/user-attachments/assets/5f473dd4-dc11-4a28-a3b2-9e7bc57d033f">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.

Supposedly users are missing the notification because it's just silently appearing in the background.

Some flakey OS operation has been reported by two different users after installation:
<img width="215" height="415" alt="image" src="/api/flow.js?q=https%3A%2F%2Fgithub.com%2Fcoder%2Fcoder-desktop-macos%2Fcompare%2F%253Ca%2520href%3D"https://github.com/user-attachments/assets/e632071d-02a3-45d3-bbef-f1bce9139974">https://github.com/user-attachments/assets/e632071d-02a3-45d3-bbef-f1bce9139974" />
<img width="247" height="191" alt="image" src="/api/flow.js?q=https%3A%2F%2Fgithub.com%2Fcoder%2Fcoder-desktop-macos%2Fcompare%2F%253Ca%2520href%3D"https://github.com/user-attachments/assets/dcd4b39b-5be4-4630-a4c8-dc45fe06bb77">https://github.com/user-attachments/assets/dcd4b39b-5be4-4630-a4c8-dc45fe06bb77" />

I don't know what's happening because the error handling here isn't very good. This PR fixes that by always including the operation that failed in the UI message.