[PM-33930] fix: Exclude items with invalid keys from TOTP section count

[matt-livefront]

🎟️ Tracking

PM-33930

📔 Objective

The "Verification codes" section count on the main vault screen was inflated when a login had a TOTP key set but the key was invalid (e.g. otpauth://totp with no secret).

incrementTOTPCount only checked whether the cipher had a TOTP key and the user had access — it didn't validate that the key could actually produce a code. The list-building path (totpItem(for:)) does attempt code generation and silently drops failures, so the two paths diverged, causing the displayed count to be higher than the number of items shown in the list.

incrementTOTPCount now attempts TOTP code generation (matching the validation already performed by totpItem(for:)) and skips the count increment if generation fails.

📸 Screenshots

Before	After
Simulator.Screen.Recording.-.iPhone.17.Pro.-.2026-03-23.at.13.52.34.mov	Simulator.Screen.Recording.-.iPhone.17.Pro.-.2026-03-23.at.13.57.40.mov

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.87%. Comparing base (5a99710) to head (3becda8).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2477   +/-   ##
=======================================
  Coverage   86.87%   86.87%           
=======================================
  Files        1846     1846           
  Lines      162969   162985   +16     
=======================================
+ Hits       141572   141589   +17     
+ Misses      21397    21396    -1     

☔ View full report in Codecov by Sentry.
📢 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.