fix(chat): patch stored message input

[Antreesy]

☑️ Resolves

• Fix Bracket html encoded when inserted into chat input + image pasted #11023
• Duplicate code from NewMessage component:

  spreed/src/components/NewMessage/NewMessage.vue

  Lines 524 to 528 in 54655bf

  	// FIXME upstream: https://github.com/nextcloud-libraries/nextcloud-vue/issues/4492
  	const temp = document.createElement('textarea')
  	temp.innerHTML = this.text.replace(/&/gmi, '&')
  	this.text = temp.value.replace(/&amp;/gmi, '&').replace(/&lt;/gmi, '<')
  	.replace(/&gt;/gmi, '>').replace(/&sect;/gmi, '§')

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

Screencast.from.30.11.2023.14.10.29.webm

🏁 Checklist

• 🌏 Tested with Chrome, Firefox and Safari or should not be risky to browser differences
• ⛑️ Tests are included or not possible

[Antreesy]

/backport to stable28

[nickvergessen]

btw would be possible to write tests for this?
So especially it doesn't break once the mentioned vue lib issue changes?

[Antreesy]

would be possible to write tests for this?

I have plans to migrate this store to Pinia, will move this patch to util and add a test there