[reconstitution] Improve font scaling and rendering

[felixdittrich92]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 90.70513% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.79%. Comparing base (5332574) to head (186d29b).

Files with missing lines	Patch %	Lines
doctr/utils/reconstitution.py	90.70%	29 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #2121 +/- ##
==========================================
- Coverage 97.00% 96.79% -0.21% 
==========================================
Files 169 169 Lines 9611 9827 +216 ==========================================
+ Hits 9323 9512 +189 - Misses 288 315 +27 

Flag	Coverage Δ
unittests	96.79% <90.70%> (-0.21%)	⬇️

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