[WIP] Fix app crash when running iOS Gallery in background

[Copilot]

• Understand the issue: App crashes when running in background on iOS Skia
• Investigate the code structure and identify the root cause
• Add background state tracking to UnoSKMetalView
• Pause rendering when app enters background
• Resume rendering when app leaves background
• Test the fix with a sample or test case
• Run code review and security checks

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Skia][Gallery][iOS] App crash when running in background</issue_title>
<issue_description>### Current behavior 🐛

Skia Gallery canary version: 1.7.0(2512220303.2143)

ScreenRecording_12-22-2025.9-42-59.AM_1.MP4

Expected behavior 🎯

Should not crash

How to reproduce it (as minimally and precisely as possible) 🔬

1. install gallery canary on iOS device
2. Open the app
3. keep the app running in the background
4. Observe the crash

Workaround 🛠️

No response

Renderer 🎨

• Skia
• Native

Affected platforms 📱💻🖥️

iOS

Uno.Sdk version (and other relevant versions) 📦

No response

IDE version 🧑‍💻

No response

Anything else we need to know? 💬

No response</issue_description>

<agent_instructions>test this issue</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@agneszitte This issue needs to be reviewed to see if it is still happening with latest versions @morning4coffe-dev This might actually get also fixed by https://github.com//pull/22368

• Fixes [Skia][Gallery][iOS] App crash when running in background #22199

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