[reconstitution] Improve font scaling and rendering

[felixdittrich92]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 89.53488% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.78%. Comparing base (5332574) to head (39deebe).

Files with missing lines	Patch %	Lines
doctr/utils/reconstitution.py	89.53%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2121      +/-   ##
==========================================
- Coverage   97.00%   96.78%   -0.22%     
==========================================
  Files         169      169              
  Lines        9611     9776     +165     
==========================================
+ Hits         9323     9462     +139     
- Misses        288      314      +26     

Flag	Coverage Δ
unittests	96.78% <89.53%> (-0.22%)	⬇️

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