feat: Feature notifications

[georgylobko]

Description

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

❌ Patch coverage is 60.40609% with 78 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.86%. Comparing base (e4cf4d5) to head (58d1e87).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...efresh-toolbar/state/use-feature-notifications.tsx	26.86%	49 Missing ⚠️
...ar/drawer/feature-notifications-drawer-content.tsx	0.00%	19 Missing ⚠️
src/internal/plugins/widget/index.ts	40.00%	6 Missing ⚠️
...ut/visual-refresh-toolbar/state/use-app-layout.tsx	60.00%	2 Missing ⚠️
...visual-refresh-toolbar/toolbar/drawer-triggers.tsx	87.50%	1 Missing ⚠️
...l-refresh-toolbar/toolbar/trigger-button/index.tsx	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4186      +/-   ##
==========================================
- Coverage   97.15%   96.86%   -0.29%     
==========================================
  Files         874      880       +6     
  Lines       25660    25827     +167     
  Branches     9285     9340      +55     
==========================================
+ Hits        24929    25018      +89     
- Misses        684      803     +119     
+ Partials       47        6      -41     

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