Playの編集画面の保存ボタン等をstickyにする など

[FineArchs]

What

Playの編集画面の、

• 下部の保存/表示/削除ボタンをstickyに ( #14408 )
• 公開範囲の選択ボタンを上部へ移動

https://github.com/user-attachments/assets/ef8fe36d-e37e-4cfb-9514-9ae854a61bf8

Why

• 画面をスクロールしなくても保存・表示が行われるようにする
• 公開範囲は重要な設定項目であるため上部に置く

Additional info (optional)

表示/削除ボタンの背景が強く透過されているが、デザイン的に良いのか悪いのかはわからない　修正済み

Checklist

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

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 24 lines in your changes missing coverage. Please review.

Project coverage is 19.72%. Comparing base (daf9ae5) to head (228ad91). Report is 60 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/frontend/src/pages/flash/flash-edit.vue	0.00%	24 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #14429 +/- ## =========================================== + Coverage 19.53% 19.72% +0.18% =========================================== Files 713 713 Lines 100375 100388 +13 Branches 997 995 -2 =========================================== + Hits 19612 19802 +190 + Misses 80219 80044 -175 + Partials 544 542 -2 ```

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[kakkokari-gtyih]

コンフリクト解消

[kakkokari-gtyih]

コンフリクト解消

[syuilo]

👍🏻