Fix RTL: isolate dir overrides and support dynamic dir updates

[andycall]

What

• Fixes RTL inline layout when descendants override direction (e.g. dir="ltr" phone numbers inside dir="rtl").
• Supports dynamic updates to
  documentElement.dir and ensures logical margins remap correctly.

How

• Insert Unicode bidi isolate controls for element-level dir changes during inline item collection
  and emit them into the paragraph.
• Update logical margin mapping to respect direction changes.

Tests

• Added widget regression: webf/test/src/rendering/ rtl_inline_dir_isolate_test.dart.
• Added integration spec + snapshots:
  • integration_tests/specs/css/css-rtl/rtl-inline-dir-isolate.ts
  • integration_tests/specs/css/ css-inline-formatting/dir-dynamic-update.ts

[vercel]

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Project	Deployment	Actions	Updated (UTC)
use-case	Ready	Preview, Comment	Feb 3, 2026 7:50pm
vue_usecase	Ready	Preview, Comment	Feb 3, 2026 7:50pm