stages/identification: Add WebAuthn conditional UI (passkey autofill) support

[melizeche]

Details

Enables passwordless login via browser passkey autofill dropdown, allowing users to authenticate with discoverable credentials without entering a username first

reference:

• https://github.com/w3c/webauthn/wiki/Explainer:-WebAuthn-Conditional-UI

• https://developers.yubico.com/WebAuthn/Concepts/Passkey_Autofill/Implementation_Guidance/Autofill_-_Conditional_UI_Browser_Feature_Detection.html

closes #4749

---

Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make docs)

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[codecov]

Codecov Report

❌ Patch coverage is 98.96907% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.23%. Comparing base (68d0b02) to head (056830b).
⚠️ Report is 35 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
authentik/stages/identification/stage.py	97.56%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18377      +/-   ##
==========================================
- Coverage   93.25%   93.23%   -0.03%     
==========================================
  Files         942      946       +4     
  Lines       51586    51860     +274     
==========================================
+ Hits        48106    48350     +244     
- Misses       3480     3510      +30     

Flag	Coverage Δ
e2e	44.76% <45.36%> (-0.02%)	⬇️
integration	23.28% <16.49%> (+<0.01%)	⬆️
unit	91.47% <98.96%> (-0.01%)	⬇️
unit-migrate	91.51% <98.96%> (-0.01%)	⬇️

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[github-actions]

authentik PR Installation instructions

Instructions for docker-compose

Add the following block to your .env file:

AUTHENTIK_IMAGE=ghcr.io/goauthentik/dev-server
AUTHENTIK_TAG=gh-056830be1839e4bdd9d3070a63a5408d10ccfabb
AUTHENTIK_OUTPOSTS__CONTAINER_IMAGE_BASE=ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s

Afterwards, run the upgrade commands from the latest release notes.

Instructions for Kubernetes

Add the following block to your values.yml file:

authentik:
    outposts:
        container_image_base: ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s
global:
    image:
        repository: ghcr.io/goauthentik/dev-server
        tag: gh-056830be1839e4bdd9d3070a63a5408d10ccfabb

Afterwards, run the upgrade commands from the latest release notes.

[kensternberg-authentik]

Runs, does what it says, passes lint and type checking. Code looks solid and well-organized.