[PM-27137] feat: Add credential deletion and debug info to Use Passkey screen

[morganzellers-bw]

🎟️ Tracking

PM-27137

📔 Objective

Fourth and final PR in a 4-PR stack adding SDK-backed passkey test scenarios to TestHarness. Stacked on #2947.

• Adds swipe-to-delete for registered credentials on the "Use Passkey (SDK)" screen, threaded through SDKFido2CredentialStore/SDKPasskeyService/SDKUsePasskeyProcessor.
• Surfaces cipher ID, user handle, and signature-counter usage on each credential row for easier debugging.

📸 Screenshots

---

Stack: #2945 → #2946 → #2947 → #2948

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

Reviewed the fourth and final PR in the SDK-passkey TestHarness stack, which adds swipe-to-delete for registered credentials on the "Use Passkey (SDK)" screen and surfaces cipher ID, user handle, and signature-counter usage on each credential row. Deletion threads consistently through DefaultFido2CredentialStore → DefaultPasskeyService → UsePasskeyProcessor, keeping the actor's in-memory cipher list and CipherStorageService persistence in sync, with new tests at the store, service, and processor layers covering both the success and throwing paths. The four new localization keys are unique in Localizable.strings and their Localizations accessors are SwiftGen-generated at build time (swiftgen-bwth.yml), while the Fido2CredentialAutofillView fixture already exposes the cipherId/hasCounter parameters the view and tests rely on. All changes stay inside the TestHarness target — an internal engineering harness backed by a synthetic identity — and touch no production Password Manager or Authenticator code.

Code Review Details

No findings met the confidence threshold for posting. The earlier test-seeding gap in UsePasskeyProcessorTests is resolved in e802917 — state.registeredCredentials is seeded before the delete effect and registeredCredentialsCalled is asserted, so the reload behavior is genuinely covered. Mock member names (deleteCredentialReceivedCipherId, deleteCredentialThrowableError) match what the AutoMockable stencil generates for a single-parameter throwing method.

• ❓ QUESTION: The description notes screenshots of the new credential row layout and swipe action were not captured; worth adding before merge.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.53%. Comparing base (42b2e54) to head (e802917).

Additional details and impacted files

@@                           Coverage Diff                            @@
##           pm-27135-testharness-use-passkeys-ui    #2948      +/-   ##
========================================================================
+ Coverage                                 79.52%   79.53%   +0.01%     
========================================================================
  Files                                      1169     1169              
  Lines                                     75095    75095              
========================================================================
+ Hits                                      59720    59730      +10     
+ Misses                                    15375    15365      -10     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.