supabase / supabase / 27744115597

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Auth flow improvements (#46967)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES/NO

## What kind of change does this PR introduce?

Bug fix, feature, docs update, ...

## What is the current behavior?

Please link any relevant issues here.

## What is the new behavior?

Feel free to include screenshots if it includes visual changes.

## Additional context

Add any other context or screenshots.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

## Release Notes

* **New Features**
* Added “Continue with {provider}” sign-in and sign-up flows using
enabled external identity providers.
* Enabled inbound branding to focus a specific provider for customized
sign-in/sign-up experiences.

* **Improvements**
* Refined the sign-in options layout and “last used” tracking for
clearer authentication choices.
* Updated account identity/provider connection experiences (link/unlink
and management UI).

* **Bug Fixes**
  * Fixed hydration mismatches in sign-in and password-related layouts.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Co-authored-by: Joshen Lim <joshenlimek@gmail.com>

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