fix(frontend): 画面を閉じる直前にAudioContextを閉じるように

[kakkokari-gtyih]

What

書いてあるとおり

Why

Chrome 系 on macOS で AudioContext 開きっぱなしの状態でタブ閉じると他のタブのオーディオが壊れる問題にぶち当たる（らしい）

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 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 18.87%. Comparing base (ef29130) to head (5ba5d13).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/frontend/src/scripts/sound.ts	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop   #15080       +/-   ##
============================================
- Coverage    37.74%   18.87%   -18.88%     
============================================
  Files         1601      762      -839     
  Lines       204016   110763    -93253     
  Branches      3713     1231     -2482     
============================================
- Hits         77014    20903    -56111     
+ Misses      126364    89275    -37089     
+ Partials       638      585       -53     

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[syuilo]

chromeのバグということを明記した方が良さそう

[mi-gh-maintainer]

Thank you 🙏