[UI] Enable strict TypeScript checking for ClassName, Sign and Keys p…

[PunugupatiSaikumar]

…## Changes

• Remove @ts-strict-ignore from ClassnamePipe, SignPipe and KeysPipe.
• Add explicit input and return types.
• Preserve KeysPipe value types through a generic parameter.
• Keep existing runtime behavior, including null/undefined passthrough.

[codecov]

Codecov Report

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

❌ Your patch status has failed because the patch coverage (40.00%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3966      +/-   ##
=============================================
- Coverage      55.47%   55.47%   -0.00%     
+ Complexity     19535    19534       -1     
=============================================
  Files           3861     3859       -2     
  Lines         178082   178076       -6     
  Branches       14818    14818              
=============================================
- Hits           98772    98764       -8     
- Misses         75425    75427       +2     
  Partials        3885     3885              

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[sfeilmeier]

Could have been better... I reworked everything.