Refactor primer design sequence tab components

[manulera]

Refactor PrimerDesigner.jsx to improve readability and maintainability.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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[codecov]

Codecov Report

❌ Patch coverage is 86.95652% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.57%. Comparing base (533fa15) to head (ea4e0f6).

Files with missing lines	Patch %	Lines
...er_design/SequenceTabComponents/PrimerDesigner.jsx	86.95%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #537      +/-   ##
==========================================
- Coverage   80.58%   80.57%   -0.02%     
==========================================
  Files         176      176              
  Lines        6110     6121      +11     
  Branches     1294     1304      +10     
==========================================
+ Hits         4924     4932       +8     
- Misses       1186     1189       +3     

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[manulera]

Can you summarise the changes @cursor

[manulera]

Can you summarise the changes @cursoragent