fix(ModalPageHeader): Широкий сепаратор в режиме regular

[mendrew]

• close [Bug]: Некорректные боковые оступы у сепаратора ModalPageHeader  #6722

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• Дизайн-ревью

Описание

После f7c9098 мы стали рисовать сепаратор независимо от платформы, но судя по дизайну широкий сепаратор нужен только в режиме regular.

Изображения

	До	После
Regular

[github-actions]

size-limit report 📦

Path	Size
JS	356.9 KB (+0.01% 🔺)
JS (gzip)	108.94 KB (+0.01% 🔺)
JS (brotli)	90.08 KB (+0.03% 🔺)
JS import Div (tree shaking)	1.43 KB (0%)
CSS	261.8 KB (0%)
CSS (gzip)	34.36 KB (0%)
CSS (brotli)	27.86 KB (0%)

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e2e tests

Playwright Report

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👀 Docs deployed

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Commit 466688f

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.36%. Comparing base (a3b96b2) to head (466688f).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6726   +/-   ##
=======================================
  Coverage   82.36%   82.36%           
=======================================
  Files         335      335           
  Lines       10347    10351    +4     
  Branches     3466     3467    +1     
=======================================
+ Hits         8522     8526    +4     
  Misses       1825     1825           

Flag	Coverage Δ
unittests	82.36% <100.00%> (+<0.01%)	⬆️

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