タイムラインのヘッダータブ関連の修正

[adzukimame]

What

Why

Additional info (optional)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 43.35%. Comparing base (6dc7088) to head (6bf153f).
Report is 1 commits behind head on develop-mame.

Files with missing lines	Patch %	Lines
packages/frontend/src/pages/settings/timeline.vue	0.00%	6 Missing ⚠️
...rontend/src/pages/settings/preferences-backups.vue	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           develop-mame     #332      +/-   ##
================================================
- Coverage         43.44%   43.35%   -0.09%     
================================================
  Files              1200     1200              
  Lines            151940   151935       -5     
  Branches           3476     3477       +1     
================================================
- Hits              66006    65879     -127     
- Misses            85934    86056     +122     

Flag	Coverage Δ
frontend_vitest	25.30% <0.00%> (-0.17%)	⬇️
misskey-js	92.77% <ø> (ø)

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