fix: モバイル表示のときページ下部がナビゲーションバーに隠れる問題を修正

[ibuki2003]

What

fix: #11317

ページ下部に挿入される余白の高さ --minBottomSpacing の値を、
media queryではなくJSで実際のnavbarの表示と連動させて設定するようにしました。

Why

navbarに隠れて操作できない領域が発生していたため。

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

Merging #11370 (cefd825) into develop (8851e90) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop   #11370      +/-   ##
===========================================
- Coverage    77.71%   77.66%   -0.05%     
===========================================
  Files          920      745     -175     
  Lines        92734    70976   -21758     
  Branches      7748     7251     -497     
===========================================
- Hits         72064    55125   -16939     
+ Misses       20670    15851    -4819     

see 176 files with indirect coverage changes

[syuilo]

👍🏻