[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 on the "Use Passkey (SDK)" screen and surfaces cipher ID, user handle, and signature-counter info on each credential row. Deletion is threaded consistently through DefaultFido2CredentialStore → DefaultPasskeyService → UsePasskeyProcessor, with the in-memory cipher list and CipherStorageService persistence kept in sync, and new tests cover the store, service, and processor layers including the throwing path. Changes are confined to TestHarnessShared, an internal engineering harness, and touch no production Password Manager or Authenticator code. The earlier test-seeding gap in UsePasskeyProcessorTests is resolved — registeredCredentials is now seeded before the delete effect so the reload behavior is actually asserted.

Code Review Details

No findings met the confidence threshold for posting.

• ❓ QUESTION: PR 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 79.50%. Comparing base (0064e31) to head (30554fe).

Additional details and impacted files

@@                            Coverage Diff                            @@
##           pm-27135-testharness-use-passkeys-ui    #2948       +/-   ##
=========================================================================
+ Coverage                                 39.67%   79.50%   +39.83%     
=========================================================================
  Files                                       362     1169      +807     
  Lines                                     16971    75028    +58057     
=========================================================================
+ Hits                                       6733    59650    +52917     
- Misses                                    10238    15378     +5140     

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