cherry-pick: blinkアニメーションが動作していないのを修正

[adzukimame]

What

• fix(frontend): blinkアニメーションが動作していないのを修正

Why

Additional info (optional)

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 12 lines in your changes missing coverage. Please review.

Project coverage is 43.53%. Comparing base (a1b9786) to head (0be265d).
Report is 1 commits behind head on develop-mame.

Files with missing lines	Patch %	Lines
packages/frontend/src/ui/deck.vue	0.00%	4 Missing ⚠️
packages/frontend/src/components/MkLaunchPad.vue	0.00%	2 Missing ⚠️
...ges/frontend/src/ui/_common_/navbar-for-mobile.vue	0.00%	2 Missing ⚠️
packages/frontend/src/ui/_common_/navbar.vue	0.00%	2 Missing ⚠️
packages/frontend/src/ui/universal.vue	0.00%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           develop-mame     #321   +/-   ##
=============================================
  Coverage         43.53%   43.53%           
=============================================
  Files              1199     1199           
  Lines            151616   151610    -6     
  Branches           3465     3465           
=============================================
- Hits              66001    66000    -1     
+ Misses            85615    85610    -5     

Flag	Coverage Δ
frontend_vitest	25.57% <25.00%> (+<0.01%)	⬆️
misskey-js	92.77% <ø> (ø)

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