Add Curving Road

[Seren-35]

Source: http://inabapuzzle.com/honkaku/curving.html

In edit mode, I made circle placement follow the same behavior as shaded cells in dynasty genres, since two circles can never be adjacent in a solvable puzzle, whereas circles one empty cell apart seem to be a common pattern in puzzles I've seen.

When checking for paths that turn only once, at most one erroneous path per circle is highlighted. There can be quadratically many of those in total so highlighting all of them in sufficiently wrong answers can easily cover most of the grid and turn it unreadable. This seemed like a good compromise.

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[x-sheep]

Thanks for the contribution! I like how the error highlighting looks.

[x-sheep]

Thanks for doing the changes. I'm going to release San-Anko on monday, and this genre 2 weeks after.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.29630% with 2 lines in your changes missing coverage. Please review.

Project coverage is 91.17%. Comparing base (714f14f) to head (0cd0f60).
Report is 7 commits behind head on main.

Files	Patch %	Lines
src/variety/curving.js	96.29%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #538      +/-   ##
==========================================
+ Coverage   91.16%   91.17%   +0.01%     
==========================================
  Files         190      192       +2     
  Lines       20976    21097     +121     
==========================================
+ Hits        19122    19236     +114     
- Misses       1854     1861       +7     

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