[PM-26063] Update Authenticator's settings view to latest designs

[matt-livefront]

🎟️ Tracking

PM-26063

📔 Objective

Updates the Authenticator's settings view to match the latest designs, in preparation for adding the Flight Recorder. I also removed SettingsMenuField after migrating the last remaining usages to BitwardenMenuField.

📸 Screenshots

Before	After

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[claude]

Claude encountered an error —— View job

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I'll analyze this and get back to you.

[github-actions]

Checkmarx One – Scan Summary & Details – 23a4ef96-9bb5-420a-894b-348f83ac1730

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

❌ Patch coverage is 92.79279% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.67%. Comparing base (e030fbf) to head (7ae5fc7).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...d/UI/Platform/Settings/Settings/SettingsView.swift	93.33%	6 Missing ⚠️
...latform/Application/Views/BitwardenMenuField.swift	89.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2113      +/-   ##
==========================================
- Coverage   85.23%   83.67%   -1.56%     
==========================================
  Files        1709     1976     +267     
  Lines      145501   161210   +15709     
==========================================
+ Hits       124019   134897   +10878     
- Misses      21482    26313    +4831     

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