refactor: migrate to signals

[cipchk]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ng-alain/delon/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[cipchk]

Preview is ready!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.97%. Comparing base (a1c4fb1) to head (3eb7c0f).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #1883    +/-   ##
========================================
  Coverage   94.96%   94.97%            
========================================
  Files         273      273            
  Lines        8862     8851    -11     
  Branches     1714     1814   +100     
========================================
- Hits         8416     8406    -10     
  Misses        366      366            
+ Partials       80       79     -1     

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