[triple-document] sticky-tabs의 z-index 수정

[kooinsung]

PR 설명

�triple-document의 animaion 컴포넌트가 탭 컴포넌트보다 상위로 올라오는 이슈를 수정

변경 내역

체크리스트

스크린샷 & URL

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 10.27%. Comparing base (742814c) to head (7ae5199).

Files	Patch %	Lines
...kages/triple-document/src/elements/sticky-tabs.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              v13    #3235   +/-   ##
=======================================
  Coverage   10.27%   10.27%           
=======================================
  Files         710      710           
  Lines       33713    33713           
  Branches     9166     9166           
=======================================
  Hits         3465     3465           
  Misses      30241    30241           
  Partials        7        7           

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