feat: add focus handler for doc

[wzhudev]

• I am sure that the code is update-to-date with the dev branch.

close #

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 31.30%. Comparing base (c781f22) to head (eeecafc).

Files	Patch %	Lines
...kages/docs-ui/src/controllers/doc-ui.controller.ts	0.00%	6 Missing ⚠️
packages/ui/src/services/layout/layout.service.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1433      +/-   ##
==========================================
- Coverage   31.30%   31.30%   -0.01%     
==========================================
  Files         876      876              
  Lines       49085    49091       +6     
  Branches    10132    10132              
==========================================
  Hits        15366    15366              
- Misses      33719    33725       +6     

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