fix: user blocking feedback

[lorenzo-ranciaffi]

Pull Request Description

Fixes #6315

What does this PR change?

This PR adds a toast message for when you block/unblock a user so that the feedback is always present.

On top of that, it solves the issue of the user context menu staying open after clicking on "Block" making it report the wrong friend status.
This PR also handles the nearby and community chat user states: when you block/unblock someone, the user list now reacts properly hiding/showing the user.
There was also a bug in the community chat: if a blocked user sent a message, you were able to see it. This was caused because the filter was checking the livekit proxy address instead of the real sender.

Test Instructions

Prerequisites

• you can use two accounts at the same time to speed up things (using the same client)

Test Steps

1. Test all the repro step described in the linked issue.

Test cases:

1. blocking/unblocking a user shows a toast message in the top of the screen
2. block a user from the nearby list -> user must disappear on both ends both in world and from the list. You cannot read their new messages
3. block a user from the community chat participant -> user must disappear on both ends both in world and from the list. You cannot read their new messages
4. unblocking someone makes them visible in both nearby and community chat member list (if they are still online)
5. When you block someone using their context menu, the menu closes after the operation
6. You can block a user from the community card member list -> the friendship status changes and you no longer see the "block" option from the context menu
7. Private DMs to a blocked user suggest you to unblock them (on their end, they see you offline)

These should be most of them if not all. If I missed some combination, feel free to add them.

Quality Checklist

• Changes have been tested locally
• Documentation has been updated (if required)
• Performance impact has been considered
• For SDK features: Test scene is included

Code Review Reference

Please review our Code Review Standards before submitting.

[github-actions]

Windows and Mac build successful in Unity Cloud! You can find a link to the downloadable artifact below.

Name	Link
Commit	e6ddcb8
Logs	https://github.com/decentraland/unity-explorer/actions/runs/20365710094
Download Windows	https://github.com/decentraland/unity-explorer/suites/52648377583/artifacts/4922827666
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/6315-user-block-feedback/pr-16909-e6ddcb8/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/52648377583/artifacts/4922606078
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/6315-user-block-feedback/pr-16909-e6ddcb8/Decentraland_macos.zip
Built on	2025-12-19T10:13:08Z