refactor: process all queued keyboard events at once

[marc2332]

Closes #628

[codecov]

Codecov Report

Attention: Patch coverage is 96.29630% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 73.32%. Comparing base (6212fd0) to head (6ea81ea).

Files	Patch %	Lines
crates/renderer/src/app.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #629      +/-   ##
==========================================
+ Coverage   73.31%   73.32%   +0.01%     
==========================================
  Files         194      194              
  Lines       19613    19614       +1     
==========================================
+ Hits        14379    14382       +3     
+ Misses       5234     5232       -2     

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