Feat: register_post_form_actionでcwを変更可能にする

[tai-cha]

What

register_post_form_actionでcwを変更可能にする
resolve #11910

Why

CWをなんとかしたい的な需要はあるがMisskey本体のカスタムでは難しいものもあるためプラグインで変更可能にすることで利便性を高める

Additional info (optional)

動作確認用に書いたプラグイン

/// @ 0.13.3
### {
  name: "test"
  version: "0.1.1"
  author: "taichan"
  description: "CWをワンボタンで呼び出します"
  permissions: []
  config: {
    cwList: {
      type: 'string'
      label: "セットするCWのリスト"
      description: "記憶するCWの文章を入力（複数の場合はカンマ区切りで）"
      default: ""
    }
  }
}

each let cw, Plugin:config.cwList.split(",") {
  Plugin:register_post_form_action(`CWをセット: {cw.slice(0, 5)}`, @(f, update){ update("cw", cw) })
}

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

All modified lines are covered by tests ✅

Comparison is base (ce1218a) 78.77% compared to head (6c941bf) 78.80%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #11911      +/-   ##
===========================================
+ Coverage    78.77%   78.80%   +0.02%     
===========================================
  Files          928      929       +1     
  Lines        98692    98799     +107     
  Branches      7849     7854       +5     
===========================================
+ Hits         77743    77856     +113     
+ Misses       20949    20943       -6     

Files	Coverage Δ
packages/frontend/src/components/MkPostForm.vue	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[syuilo]

👍🏻