perf(webf): optimize flex layout and fix text invalidation regressions

[andycall]

Summary

• optimize the flex/inline hotspot path and extend the local profiler repro coverage
• fix stale inline text/style invalidation for inherited text, currentColor, and descendant IFC ownership
• update the affected integration snapshots for text comprehensive and focus-visible cases

Validation

• cd integration_tests && npm run integration -- specs/css/css-text-mixin/text_comprehensive_test.ts specs/css/css-selectors/pseudo-focus-visible.ts
• cd integration_tests && npm run integration -- --skip-build specs/css/css-selectors/pseudo-focus-visible.ts
• broader rebuilt regression sweep previously completed with 215 specs, 0 failures, 20 pending

[vercel]

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Project	Deployment	Actions	Updated (UTC)
use-case	Ready	Preview, Comment	Mar 25, 2026 8:51am
vue_usecase	Ready	Preview, Comment	Mar 25, 2026 8:51am