fix: deep link to world redirects to Genesis after account change

[Maurizio-dcl]

Pull Request Description

Fix #8802

What does this PR change?

This PR moves the world access check from bootstrap to post-auth in the loading flow, this fixes a bug where changing accounts would lead to an inconsistent state regarding world permission since they were checked only against the initial identity.

Moved world access check from bootstrap to post-auth in the loading flow, so it runs against the identity the user actually picked (rather than the cached one).
Removed the now-dead IsUserAuthorisedToAccessWorldAsync from IRealmController.

Test Instructions

Prerequisites

• Launch this PR's build with --realm=italy2026.dcl.eth --position 20,20 args.
• Two accounts available: one with access to italy2026.dcl.eth, one without (can be tested with any world to which at least one of your accounts have access).

Test Steps

1. Primary repro (cached account has NO access, switch to one that does):

   • Make sure the cached account does NOT have access to the target restricted world
   • Open the client via deep link to the restricted world
   • On the auth screen, click "Change Account" and log in with the account that DOES have access
   • Click "Enter Decentraland"
   • Expected: lands in the world (no Genesis fallback)

2. Reverse case (cached account HAS access, switch to one that doesn't):

   • Cached account has access to the restricted world
   • Open the client via deep link to that world
   • On the auth screen, change to an account without access
   • Click "Enter Decentraland"
   • Expected: loading screen shows, then the user is sent to Genesis with a chat message "Could not enter '' due to world permissions. You were sent to Genesis Plaza."

3. Direct entry regression:

   • Cached account has access → deep link to that world → enter without switching accounts
   • Expected: lands in the world at the deep-linked coordinates

4. Public world:

   • Deep link to a public/unrestricted world → enter with any account
   • Expected: lands in the world

5. Normal launch (no deep link):

   • Expected: goes to home/Genesis as usual

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

[github-actions]

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

Name	Link
Commit	3171292
Logs	https://github.com/decentraland/unity-explorer/actions/runs/26227475449
Download Windows	https://github.com/decentraland/unity-explorer/suites/70124390681/artifacts/7137220804
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/8802-deep-link-into-a-world-takes-to-genesis-city-instead/pr-22538-3171292/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/70124390681/artifacts/7137259508
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/8802-deep-link-into-a-world-takes-to-genesis-city-instead/pr-22538-3171292/Decentraland_macos.zip
Built on	2026-05-21T13:40:43Z

[m3taphysics]

PR #8848, run #26229701217

Builds: Windows change, Windows baseline, macOS change, macOS baseline

Framework 13 i7

Metric	Change	Baseline	Delta	Improvement
Samples	2700	2700
CPU average	33.3 ms	33.3 ms	0.0 ms	-0.0%	⚪
CPU 1% worst	33.6 ms	33.5 ms	0.1 ms	-0.3%	⚪
CPU 0.1% worst	35.6 ms	34.5 ms	1.1 ms	-3.3%	🔴
GPU average	7.9 ms	8.1 ms	-0.1 ms	1.7%	⚪
GPU 1% worst	19.2 ms	19.6 ms	-0.4 ms	2.1%	⚪
GPU 0.1% worst	25.2 ms	26.3 ms	-1.0 ms	4.0%	🟢