Fix CSS/layout edge cases, improve routing, add ListView scrollByIndex

[andycall]

Summary

• Adds WebFListView.scrollByIndex() (Dart + typings + React wrapper) and an integration test.
• Improves routing: switch demos to go_router, add dynamic route mounting support in @openwebf/react-router, and fix RouterView lifecycle/maybePop issues.
• Fixes multiple CSS/rendering edge cases: Tailwind gradient empty position, background-clip/clip-text relayout, ch unit, logical padding direction resolution, empty custom properties, negative font-size/padding guards,
  and position: fixed with transformed containing blocks.
• Reduces Blink “unstyled” flicker by hiding elements until Blink reports style resolved; adds Blink inline-style validation coverage.
• Respects MediaQuery TextScaler/boldText across WebF + RouterView.
• Fixes GIF + data-URI SVG image loading; adjusts ListView/overflow scrolling behavior.
• Updates iOS podspec and includes missing iOS CSS invalidation sources.
• Updates/extends unit tests and integration snapshots.

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Project	Deployment	Review	Updated (UTC)
use-case	Ready	Preview, Comment	Dec 25, 2025 10:11pm

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch dev/0.24.0

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