[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

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Stack: #2945 → #2946 → #2947 → #2948

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

Reviewed the final PR in the SDK-passkey TestHarness stack, which adds swipe-to-delete for registered credentials and surfaces cipher ID, user handle, and signature-counter usage on each credential row. The delete path traces cleanly from UsePasskeyView → UsePasskeyEffect → UsePasskeyProcessor → PasskeyService → DefaultFido2CredentialStore, where the actor removes the matching cipher from its in-memory list and persists the full updated list through the injected CipherStorageService; because DefaultPasskeyService caches a single sessionTask, all callers share one store instance, so the in-memory list and the UserDefaults-backed persistence stay in sync. New unit tests cover the success, no-match, and failure paths at the store, service, and processor layers, and the mock member names (deleteCredentialReceivedCipherId, deleteCredentialThrowableError, saveReceivedCiphers) match what AutoMockable.stencil generates for single-parameter methods. All new localization keys are unique in the single en.lproj catalog, and every change is confined to the TestHarness target and its synthetic identity, so no production code path or real vault data is affected.

Code Review Details

No blocking or noteworthy code findings.

PR Metadata Assessment

• ❓ QUESTION: The credential row layout and swipe-to-delete are user-visible changes, but the Screenshots section is still an empty placeholder — please attach screenshots (or a clip of the swipe) before merge, as the description itself notes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.45%. Comparing base (9f46c09) to head (dfce034).

Additional details and impacted files

@@                           Coverage Diff                            @@
##           pm-27135-testharness-use-passkeys-ui    #2948      +/-   ##
========================================================================
- Coverage                                 79.47%   79.45%   -0.02%     
========================================================================
  Files                                      1172     1172              
  Lines                                     75144    75144              
========================================================================
- Hits                                      59724    59709      -15     
- Misses                                    15420    15435      +15     

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