[PM-13028] - add fixed width to vault list icon

[jaasen-livefront]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-13028

📔 Objective

This PR adds a fixed width to the vault icons to account for potentially differing widths between icons which ensures proper alignment.

📸 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

[github-actions]

Checkmarx One – Scan Summary & Details – 20e18358-3a5a-419a-89a2-f919352f4cd8

No New Or Fixed Issues Found

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.74%. Comparing base (1e6471b) to head (18a8999).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12644   +/-   ##
=======================================
  Coverage   33.74%   33.74%           
=======================================
  Files        2918     2918           
  Lines       90994    90994           
  Branches    17200    17200           
=======================================
  Hits        30703    30703           
  Misses      57891    57891           
  Partials     2400     2400           

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