opti: contextual load

[NickKhalow]

Pull Request Description

What does this PR change?

Integrated contextual load/unload for assets to reduce RAM consumption. It saved ~250 Mb of RAM and can be applied further for all UI related assets.

Test Steps

1. Play Happy Path, validate consistency of assets (images)
2. Pay close attention to: Preview Image, Loading Screen Tips, ScreenShot Camera Grid, Controls Prefab (That shows input scheme)

Quality Checklist

• Changes have been tested locally
• Documentation has been updated https://github.com/decentraland/unity-explorer/wiki/Architecture-Overview#contextual-asset-loading
• Performance impact has been considered

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	657ec3e
Logs	https://github.com/decentraland/unity-explorer/actions/runs/17069628364
Download Windows	https://github.com/decentraland/unity-explorer/suites/43779179584/artifacts/3798612100
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/opti/contextual-load/pr-12945-657ec3e/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/43779179584/artifacts/3798552059
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/opti/contextual-load/pr-12945-657ec3e/Decentraland_macos.zip
Built on	2025-08-19T13:07:13Z

[anicalbano]

✔️ Reviewed by QA both on Mac and Windows and working as expected.

• Checked loading screens
• Avatar behavior
• Camera grid when taking pictures
• General functionalities of images on loading

13.08.2025_11.51.14_REC.mp4

[popuz]

LGTM.