fix: misleading endpoint status codes and error messages

[jescalada]

Fixes #1285. Based on #1202, would love to get that one merged first!

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[codecov]

Codecov Report

❌ Patch coverage is 72.18935% with 47 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.88%. Comparing base (7e625cd) to head (72b0eda).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
src/service/routes/push.ts	70.14%	20 Missing ⚠️
src/service/routes/auth.ts	77.64%	19 Missing ⚠️
src/service/routes/users.ts	14.28%	6 Missing ⚠️
src/service/routes/utils.ts	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1293      +/-   ##
==========================================
+ Coverage   80.85%   80.88%   +0.02%     
==========================================
  Files          66       65       -1     
  Lines        4514     4546      +32     
  Branches      778      777       -1     
==========================================
+ Hits         3650     3677      +27     
- Misses        849      854       +5     
  Partials       15       15              

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[jescalada]

I double-checked that the frontend status code handlers are still working. Since we removed a bunch of false 401 errors, most of these would get caught by the generic handler instead.

Of course, we should make these more descriptive by showing the actual error message and status code and removing the callback-based error handling entirely. This is captured in #1188

[kriswest]

LGTM!

[jescalada]

Thanks for the review @kriswest!