[PM-24939] Allow adding a new item when autofilling from context menu

[matt-livefront]

🎟️ Tracking

PM-24939

📔 Objective

Allow adding a new item when autofilling from the Autofill context menu. We don't support prefilling any fields like URLs in this case, but it at least allows a user to generate and use a password from the autofill extension.

Fixes #1868

📸 Screenshots

ScreenRecording_09-29-2025.16-00-26_1.MP4

⏰ 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

[github-actions]

Checkmarx One – Scan Summary & Details – ee5b4b47-be8e-4f42-bf97-bb990a5a8439

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.33%. Comparing base (9f0c578) to head (e18fd78).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2006      +/-   ##
==========================================
+ Coverage   81.29%   81.33%   +0.03%     
==========================================
  Files         822      823       +1     
  Lines       52015    52136     +121     
==========================================
+ Hits        42284    42403     +119     
- Misses       9731     9733       +2     

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