activity changes text is editable

[hahn-kev]

Describe the bug
the input box on the activity dialog where the changes are shown is editable, it should be readonly.

Expected behavior
Text box should not be editable, however the text should still be selectable, I think if you use the readonly attribute then you can't interact with the text anymore, this is not desired.

[rmunn]

My testing on Firefox showed that setting readonly on the text fields still allowed me to select the text and copy it to paste elsewhere, but I couldn't edit it anymore. So the readonly attribute might be what we need.

P.S. That was testing the input fields in the "View History" button on each entry.

[rmunn]

... Well, we can set a "readonly" attribute on the TextField component from svelte-ux, but it doesn't actually list readonly as a prop, and doesn't pass that attribute on to the actual HTML element. So this, like #1328, won't be quite as trivial to solve as I would have liked.

[rmunn]

svelte-ux exposes an inputEl prop so you can bind:inputEl and get the HTML element to manipulate if to need to, but https://www.github.com/techniq/svelte-ux/issues/357 is preventing us from getting it on a textfield (i.e., the Activity view). So this might actually be blocked on that upstream issue.

[hahn-kev]

@rmunn see #1370, I solved this the same way that CrdtTextField did, that is disabling the input and using some CSS to make it not look disabled

[hahn-kev]

I also opened techniq/svelte-ux#531 to fix the issue of not being able to get the multitext element in svelte-ux