fix(android): frozen snapshot rendering

[friofry]

• Prefer GPU rendering, fallback to software
• Do not stretch the snapshot image, enable clipping

freeze2.mp4

[Copilot]

Pull request overview

This PR improves Android frozen snapshot rendering by preferring GPU-backed capture and preventing the freeze overlay from stretching after the item is resized.

Changes:

• Adds Android PixelCopy-based freeze snapshot capture with software draw fallback.
• Enables clipping while the freeze overlay is visible and restores prior clip state on unfreeze.
• Stops resizing the freeze overlay on later geometry changes and adds a common backend regression test.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
mobilewebview/android/src/org/mobilewebview/MobileWebView.java	Adds PixelCopy snapshot capture path and shared snapshot delivery helpers.
mobilewebview/src/common/mobilewebviewbackend.cpp	Enables clipping during freeze, restores clip state, and stops updating overlay size on geometry changes.
mobilewebview/src/common/mobilewebviewbackend_p.h	Adds state and helper declaration for freeze clip restoration.
mobilewebview/tests/tst_mobilewebviewbackend_common.mm	Adds a regression test for keeping freeze overlay size after resize.

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[alexjba]

I still think the simplest solution would be to move the webview to the right with the navbar instead of squeezing it.
Then we would hopefully not need any stretch or additional handling. Just a 1-1 replacement of the webview

[friofry]

I still think the simplest solution would be to move the webview to the right with the navbar instead of squeezing it. Then we would hopefully not need any stretch or additional handling. Just a 1-1 replacement of the webview

Yeah, here is the issue for keeping the navbar open:

status-im/status-app#21057

I think this PR is still useful for disabling stretching in case of other geometry changes, such as on the keyboard display