Return structured prop rejection data with error codes

[tudddorrr]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 95.71429% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.30%. Comparing base (24f930b) to head (a4b5e82).

Files with missing lines	Patch %	Lines
src/routes/api/leaderboard/post.ts	96.07%	1 Missing and 1 partial ⚠️
src/routes/api/event/post.ts	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #962      +/-   ##
===========================================
+ Coverage    98.27%   98.30%   +0.03%     
===========================================
  Files          413      413              
  Lines         6825     6833       +8     
  Branches       914      919       +5     
===========================================
+ Hits          6707     6717      +10     
  Misses          48       48              
+ Partials        70       68       -2     

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