feat: window mode and resolution improvements

[mihakrajnc]

Pull Request Description

This PR changes how we handle / manage resolutions and window mode. Notably:

• Fullscreen mode dropdown was changed to a toggle
• Resolutions dropdown no longer shows refresh rate variants
• Fullscreen mode Is not FullscreenBorderless, we dropped support for exclusive mode (fixes [QA] Settings | Black screen when switching Window mode from any to Fullscreen #7131)
• When in Window mode, the window can now be freely resized, with some constraints:
  • Min / Max aspect ratio is 4:3 / 21:9
  • Min size is 640x480
• When in Window mode, the resolution dropdown is disabled and shows the current window size, without the aspect ratio.
• When in editor, both the fullscreen toggle and resolution dropdowns are disabled as they don't do anything.

What does this PR change?

All of the resolution / window management logic has been refactored / unified in NativeWindowManager, which now handles resolution changes, full screen toggling, and requesting / releasing a temporary window mode (e.g. on authentication).

The NativeWindowManager with Mac / Win native plugins is required because there are no ways to restrict aspect ration or min / max resolution with just the Unity API. Continuously checking Screen.width / Screen.height and forcing it to a specific aspect ration / size does not give good results (extremely jittery).

Test Instructions

Test switching between fullscreen and windowed mode, and resizing the window. which should stay between the min / max aspect ratios, and should not be able to be scaled bellow the minimum size.

Verify that when we request a temporary window mode (for example when in full screen mode, and authentication is requested), Explorer correctly switches to window mode and then back.

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]

New build in progress, come back later!

[DafGreco]

✔️ PR reviewed and approved by QA on both platforms following instructions playing both happy and un-happy path

Regressions for this ticket had been performed in order to verify that the normal flow is working as expected:

• [✔️ ] Backpack and wearables in world
• [✔️ ] Emotes in world and in backpack
• [✔️ ] Teleport with map/coordinates/Jump In
• [✔️ ] Chat and multiplayer
• [✔️ ] Settings

Evidence:

Screen.Recording.2026-03-20.at.11.05.28.mov

20260320-1106-22.4125018.mp4

[alejandro-jimenez-dcl]

Good work! Left some small requests.

On a side note, why do we need a native plugin? Can we have that rationale written down either in the ticket or this PR?