feat: multi tab by episode group in SubjectDetails.vue when episode count gt 20

[chivehao]

• Update the CHANGES log.
• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes #.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.10%. Comparing base (4669a22) to head (8c9942b).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #655   +/-   ##
=========================================
  Coverage     47.10%   47.10%           
  Complexity      855      855           
=========================================
  Files           196      196           
  Lines          7460     7460           
  Branches        389      389           
=========================================
  Hits           3514     3514           
  Misses         3812     3812           
  Partials        134      134           

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