Don't fold GQL `Me` data, split code to `MobileSignIn`/`DesktopSignIn`

[fiskus]

• Don't fold data early, so we can show error
• Move GQL Me call down into where it is used (in further refactoring, on mobile we can call it only when menu is opened)
• To achieve both these, I split code more explicitly into MobileSignIn and DesktopSignIn

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 51 lines in your changes are missing coverage. Please review.

Project coverage is 36.27%. Comparing base (8b8c39c) to head (3bb1775).

Files	Patch %	Lines
catalog/app/containers/NavBar/NavBar.tsx	0.00%	51 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## users-gql #3988 +/- ## ============================================= - Coverage 36.38% 36.27% -0.12% ============================================= Files 734 734 Lines 32522 32515 -7 Branches 4861 4679 -182 ============================================= - Hits 11834 11794 -40 - Misses 19539 20079 +540 + Partials 1149 642 -507 ``` | [Flag](https://app.codecov.io/gh/quiltdata/quilt/pull/3988/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=quiltdata) | Coverage Δ | | |---|---|---| | [api-python](https://app.codecov.io/gh/quiltdata/quilt/pull/3988/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=quiltdata) | `90.95% <ø> (ø)` | | | [catalog](https://app.codecov.io/gh/quiltdata/quilt/pull/3988/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=quiltdata) | `10.40% <0.00%> (-0.18%)` | :arrow_down: | | [lambda](https://app.codecov.io/gh/quiltdata/quilt/pull/3988/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=quiltdata) | `87.96% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=quiltdata#carryforward-flags-in-the-pull-request-comment) to find out more.

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[nl0]

@fiskus is this kinda ready?

[fiskus]

Thank you, yes. I waited for CI checks to complete, and then forgot to request review