Fix group and channel invitations displayed as 1:1 invites

[Copilot]

Invite links for groups (g=) and channels (b=) that also include the inviter's name (n=) were showing the user's name instead of the group/channel name, making them indistinguishable from personal invitations.

Changes

• Name display priority — reordered parameter lookup to prefer group/channel name over user name:

  // Before
  searchParams.get("n") || searchParams.get("g") || searchParams.get("a")
  // After
  searchParams.get("g") || searchParams.get("b") || searchParams.get("n") || searchParams.get("a")

• "Join" text — extended the trigger condition to include b= (broadcast/channel), not just g= (group), in both the reactInput() pre-i18n path and the i18next callback
• Tests — updated the name context (removed stray g= param), added cases for group-over-name priority, broadcast display, and broadcast-over-name priority; added broadcast localization test

Original prompt

---

This section details on the original issue you should resolve

<issue_title>group and channel invitations shown as 1:1 invitation</issue_title>
<issue_description>recently now the invite links contain the user's name even when it is a group or channel invitation, the page is displaying group/channel invitations as 1:1 invites

this is an example group invitation link:

https://i.delta.chat/#B68D965B65A63B3E7EB32D56245652E2C899213F&x=A-ylp1JHsD6-0XQ6c20Rk-6T&i=7oc7RE-CKaaOyT3thcw94UmB&s=tDtfDDPew-7sz8dC8nw-5y72&a=ps1n1dwin%40arcanechat.me&n=adb+%28TL%3BDR%29&g=food+lovers

and this is an example channel invite:

https://i.delta.chat/#0A45953086F0C166D3BAF1D4BB2025496E4C2704&x=MVPi07rQBEmHO4FRb3brpwDe&j=n8mkKqu42WAKKUCx1bQOVh23&s=eBWTd022E21N8QvAjRv6zRuE&a=arcanechat%40arcanechat.me&n=MyName&b=ArcaneChat+Channel
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes group and channel invitations shown as 1:1 invitation #50

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[Copilot]

Pull request overview

This PR fixes a bug where group and channel invitation links were incorrectly displaying the inviter's personal name instead of the group/channel name, making them indistinguishable from 1:1 personal invitations.

Changes:

• Reordered parameter lookup priority to check group (g=) and broadcast/channel (b=) names before user name (n=)
• Extended the "Join" button text condition to include broadcast parameter (b=) alongside group parameter (g=)
• Added comprehensive test coverage for the new parameter priority behavior

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
index.html	Updated parameter priority to prefer group/channel names over user names, and extended join button logic to include broadcast parameter in both pre-i18n and i18next code paths
ui-test-_misc.js	Corrected existing test by removing stray g= parameter, and added new test cases for group-over-name, broadcast, and broadcast-over-name priority scenarios
ui-test-_localize.js	Added localization test for broadcast invitations to verify correct "Join" text is displayed

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[r10s]

did not check the tests, as i am not into that test framework.

the other code changes lgtm - and are quite simple. it is really only displaying the other name