[PM-28901] Re-add error toast

[quexten]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-28901

📔 Objective

The switch to proof-of-decryption did not yet add an error toast, and so entering the wrong password resulted in no feedback. This PR re-adds an error toast for incorrect passwords.

📸 Screenshots

⏰ 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 – f7f5b6ca-c2ef-4bf8-802f-a437238ce08a

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

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.27%. Comparing base (c6b0208) to head (9e12a5b).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...d-migration/prompt-migration-password.component.ts	25.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #18161   +/-   ##
=======================================
  Coverage   42.27%   42.27%           
=======================================
  Files        3599     3599           
  Lines      104548   104552    +4     
  Branches    15780    15780           
=======================================
+ Hits        44194    44202    +8     
+ Misses      58473    58469    -4     
  Partials     1881     1881           

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