chore(frontend): bump mantine

[matmair]

Bump Mantine to v8

[netlify]

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🔨 Latest commit	a6d4e53
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Lighthouse	1 paths audited Performance: 95 (🔴 down 1 from production) Accessibility: 81 (no change from production) Best Practices: 100 (no change from production) SEO: 78 (no change from production) PWA: - View the detailed breakdown and full score reports

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.34%. Comparing base (1818757) to head (e012f10).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9694   +/-   ##
=======================================
  Coverage   86.34%   86.34%           
=======================================
  Files        1232     1232           
  Lines       54154    54153    -1     
  Branches     2248     2248           
=======================================
+ Hits        46758    46760    +2     
+ Misses       6827     6824    -3     
  Partials      569      569           

Flag	Coverage Δ
backend	88.26% <ø> (+<0.01%)	⬆️

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