Fix iOS lazy tab first-load flash#552
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What the issue is:
Lazy-loaded iOS tabs can briefly show the outgoing/default surface before the newly loaded tab content is ready, which appears as a white flash on first selection.
How this fixes it:
Unloaded lazy iOS 26+ tabs now prevent native default selection until JS handles the tab press, lazy placeholders keep the route scene style, and native page transitions are disabled while lazy tabs are still unloaded.
How to test it:
Open the example app, go to "Native Bottom Tabs with Lazy", and select the "Solid" tab for the first time. The first visible Solid frame should show the black background and red text.
Fixes #547