fix(canary): override SkiaSharp to 4.148.0 on native iOS canary builds

[ramezgerges]

Related to unoplatform/uno#23680

Problem

The canary native iOS Release build has failed daily since 2026-05-25 with:

ILLINK : error MT0099: Can't create a token reference to an unregistered type when using the managed static registrar: SkiaSharp.Views.Windows.SKSwapChainPanel
error NETSDK1144: Optimizing assemblies for size failed.

SkiaSharp 3.119.4 (published 2026-05-25, pinned by Uno.Sdk dev) ships its iOS assets as net10.0-ios26.2. CI builds with Xcode 26.1.1 / iOS 26.1, so NuGet cannot select the platform asset and silently falls back to the platform-neutral net10.0 assembly. That assembly's SKSwapChainPanel has no ObjC [Register] attribute (verified by binary inspection), and on the native-rendering head — where FrameworkElement derives from NSObject — the managed-static registrar fails at ILLink. The Skia-renderer iOS leg is unaffected.

The upstream TFM fix (mono/SkiaSharp#3798, 26.2 → 26.0) shipped in SkiaSharp 4.147.0-preview.2+; no 3.119.5 backport exists on nuget.org or the skia-eap feed.

Fix

Override SkiaSharpVersion to 4.148.0 (ships net10.0-ios26.0 assets) via the Uno.Sdk's override property, scoped to UseNativeRendering=true + iOS + canaries/* branches so master keeps the stable Uno.Sdk pin (3.119.1) for the store app.

Verification (local, Xcode 26.1.1 + iOS workload 26.1, mirroring CI)

• Reproduced the exact MT0099/NETSDK1144 failure with Uno.Sdk 6.7.0-dev.105 before the change.
• With the override: all SkiaSharp packages unify on 4.148.0 with proper net10.0-ios26.0 assets, and dotnet publish -f net10.0-ios -c Release -p:UseNativeRendering=true succeeds end-to-end (.app/.ipa produced).
• Without the canary branch variable the override is inert: dev SDK resolves 3.119.4, stable SDK resolves 3.119.1, unchanged.

Notes

• On canary, Lottie/Skottie and Svg.Skia now run against SkiaSharp 4.148.0 — worth watching the iOS UI tests for rendering regressions.
• Remove this override once the Uno.Sdk dev pin moves off 3.119.4 (or a 3.119.x backport ships).

🤖 Generated with Claude Code

[agneszitte]

Superseded by #1255. Moving this off master to canaries/dev only — per the team convention of keeping canary-only workarounds on the canary branch and leaving the default branch untouched (discussed with Ramez/Jenny). Same native-iOS SkiaSharp 4.148.0 override; the branch-source condition is dropped since #1255 lives on canaries/dev. Related to unoplatform/uno#23680