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## Summary
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importantly what they aim to achieve -->
The issue is the new WebView bridge origin check. It compares configured
URL hosts with WKSecurityOrigin.host and IPv6 can appear as fd00::abcd
in one API and [fd00::abcd] in another, so the bridge rejects valid
frontend messages. That blocks external auth and leaves the frontend
loading, while widgets still work.
This PR normalizes the url
## Screenshots
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## Link to pull request in Documentation repository
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Documentation: home-assistant/companion.home-assistant#
## Any other notes
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## Summary
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importantly what they aim to achieve -->
Remove the portWithFallback helper and update port comparisons to use
URL.port directly. baseIsEqual now compares ports via url.port (no
80/443 fallback), and SafeScriptMessageHandler passes url.port ?? 0 when
building origin keys (security origin uses port 0 when unspecified).
This simplifies port handling and avoids implicit defaulting to standard
ports.
## Screenshots
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## Link to pull request in Documentation repository
<!-- Pull requests that add, change or remove functionality must have a
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Documentation: home-assistant/companion.home-assistant#
## Any other notes
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Request is part of a bigger change, please include it here. -->
<!-- Thank you for submitting a Pull Request and helping to improve Home
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## Summary
<!-- Provide a brief summary of the changes you have made and most
importantly what they aim to achieve -->
## Screenshots
<!-- If this is a user-facing change not in the frontend, please include
screenshots in light and dark mode. -->
## Link to pull request in Documentation repository
<!-- Pull requests that add, change or remove functionality must have a
corresponding pull request in the Companion App Documentation repository
(https://github.com/home-assistant/companion.home-assistant). Please add
the number of this pull request after the "#" -->
Documentation: home-assistant/companion.home-assistant#
## Any other notes
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Request is part of a bigger change, please include it here. -->
<!-- Thank you for submitting a Pull Request and helping to improve Home
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## Summary
<!-- Provide a brief summary of the changes you have made and most
importantly what they aim to achieve -->
## Screenshots
<!-- If this is a user-facing change not in the frontend, please include
screenshots in light and dark mode. -->
## Link to pull request in Documentation repository
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corresponding pull request in the Companion App Documentation repository
(https://github.com/home-assistant/companion.home-assistant). Please add
the number of this pull request after the "#" -->
Documentation: home-assistant/companion.home-assistant#
## Any other notes
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