Feature: Hide menu item if under a threshold

[zadr]

what
I usually hit a keyboard shortcut to open up CodexBar and check on whats going on - so having it in the Menu Bar all the time is a bit much. Unless I want to check (or am about to hit a limit) I don't really need to see the status item. So, might as well hide it?

other implicit behavior
I kept the status item showing on app launch for 15s to confirm the app opened - which, anecdotally, is just long enough for me to check on the status of things, tab away, and forget about things for a few minutes at a time.

visuals
While CodexBar is open to show details, the status item will also stay visible.

Video of CodexCode showing and hiding in response to the key combo
https://github.com/user-attachments/assets/09dd8096-2313-43b4-a209-36846eb865a6

There's a menubar animation when it shows and hides. Claude claims its from macOS, and I think that's true. But, It's a bit weird to see all the time. I did a quick pass of "what if I hide the view within the status item instead of the status item itself?" but that looked worse.

Here's a screenshot of the settings page to configure all this:

I'm not totally sold on this page - and happy to change anything based on feedback, but here's whats on my list of things that are questionable:

1. I went with a textfield, but a slider at 5% intervals might make more sense?
2. The spacing between 'Only show status item when…' and the threshold text entry feels like it's a bit too tight?

implementation notes
Although I had Claude do the first pass of things, there were enough "ehhhh…" that I spent some time talking it through most of the implementation to be a bit more idiomatic. Some examples of Opus falling short:

1. insisting on validating text in the didSet of the data store instead of a Binding and clamping in a set
2. didn't want to acknowledge userDefaults.register(defaults:) existing without API docs being thrown at it (but to be fair… most people forget about this API as well 🙈)
3. couldn't figure out how to get the tests to run in under 15 seconds w/r/t/ the app launch dismissal

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