refactor: decode punycode domains for the UI

[Johann150]

What

The function getAcct is improved by a getAcctUi function. It returns a Unicode version of the domain name, instead of the punycode version. Also the acct function, which was only an alias for getAcct is refactored and removed. It was left over from the Vue3 migration.

There are a few places where getAcct is not replaced (yet):

• src/client/components/post-form.vue & src/client/ui/chat/post-form.vue
  uses account name in a post, will MFM decode IDNs correctly? if so getAcct should also be replaced with getAcctUi here because the user name is show to the user.
• src/client/pages/my-antennas/editor.vue
  will antennas correctly recognize IDNs?
• src/server/api/limiter.ts
  This could put IDNs in log files. Does the database, log and syslog protocol all support Unicode for this? And should IDNs be used here?

Why

Punycode was not always decoded in the user interface. For example:

old screenshot

new screenshot

Additional info

related: #5826

[syuilo]

Thank you!
One concern is that when a user copies acct, the punycode will still be decoded when pasted, and will not be recognized correctly when mentioning, etc.

[Johann150]

Yes I see. That is also why I did not change anything in post-form.vue yet, so autocompletion will currently still insert the punycoded name.

But as a user I would expect that an IDN would be correctly recognized if I type it in manually or copy it from somewhere else like Mastodon or a web page. So I think this is another issue in MFM, that we should solve too. Do you agree?

[syuilo]

We do not want to interpret unencoded punycodes, because MFM should be parsed according to the specification. (As well as not interpreting URLs that are not percent encoded)

Perhaps we need to make it so that when a punycode-decoded acct is pasted into the submission form, it is automatically encoded. However, for users who are not familiar with punycode, they may misunderstand that it was not pasted correctly.
The extent to which Misskey will support punycode may need to be considered.
So, I'm going to put this PR on hold for now🙏

[Johann150]

Sure 👍

I think I will open a separate issue for discussion?

[Johann150]

When misskey-dev/mfm.js#86 gets merged, MFM will be able to parse IDN mentions correctly, which will check the first item off the list.

The implementation of acct has been changed so that part now has to be solved as misskey-dev/misskey.js#32