Update editor on quote reply

[Soxasora]

Description

The editor initializes itself with appendValue (quote reply) if available, but doesn't keep track of appendValue changes, breaking quote reply on full items that already have the reply box open.

This PR fixes this via QuoteReplyPlugin that simply reacts to appendValue changes and replaces text content.

Additional Context

I didn't create an extension because appendValue, not being a stable prop, would have caused re-renders of the editor

Checklist

Are your changes backward compatible? Please answer below:

For example, a change is not backward compatible if you removed a GraphQL field or dropped a database column.

On a scale of 1-10 how well and how have you QA'd this change and any features it might affect? Please answer below:
8, actually really good, got to use quote reply more

For frontend changes: Tested on mobile, light and dark mode? Please answer below:

Did you introduce any new environment variables? If so, call them out explicitly here:

Did you use AI for this? If so, how much did it assist you?

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Note

Add QuoteReplyPlugin and plumb appendValue so the editor updates when the quote-reply content changes.

• Editor:
  • Pass appendValue to EditorContent and initialize state with appendValue || text.value.
• Plugins:
  • Add QuoteReplyPlugin that reacts to appendValue changes and reinitializes the editor state.
  • Wire QuoteReplyPlugin into the editor plugin stack.

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[Soxasora]

Editor initial state now uses only existing Formik text.value (no longer initializes with appendValue).

I mean we probably should initialize with appendValue anyway if it's present, to avoid flashes from text (if present)

[huumn]

First off, get some rest! You deserve it and this isn't super high priority.

I don't think this behavior is right. Every time I call quote reply it deletes anything I've already put in the text field. I think we want it to append the Value.

[Soxasora]

I thought about appending the Value too lol. But for some reason I also thought that it was meant to replace the whole editor.

I'll take some rest now, will switch to the native insertText tomorrow.

[adlai]

only reading this as part of my gradual familiarising with the codebase;

and I wonder whether it would be possible, in some future patch, to insert the quoted lines at the cursor position, rather than appending ?

[Soxasora]

I was thinking of implementing quote replies exactly like that. In absence of selection it will just append the content.