enhance(frontend): 時刻表示を常に絶対時刻にできるように

[kakkokari-gtyih]

What

Why

Fix #14786

Additional info (optional)

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Add story of storybook
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

[codecov]

Codecov Report

Attention: Patch coverage is 68.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 19.22%. Comparing base (a6a1e3d) to head (5d834fb).

Files with missing lines	Patch %	Lines
packages/frontend/src/store.ts	0.00%	4 Missing ⚠️
packages/frontend/src/pages/settings/general.vue	0.00%	3 Missing ⚠️
packages/frontend/src/components/global/MkTime.vue	94.44%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #14806       +/-   ##
============================================
- Coverage    39.51%   19.22%   -20.30%     
============================================
  Files         1557      724      -833     
  Lines       196654   103263    -93391     
  Branches      3560      997     -2563     
============================================
- Hits         77714    19848    -57866     
+ Misses      118336    82862    -35474     
+ Partials       604      553       -51     

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[kakkokari-gtyih]

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