Add option to control URL open target (same tab vs new tab)

[franco-zalamena-iterable]

Summary

• Add configurable openLinksInNewTab static property to IterableConfig that controls whether URLs are opened in a new tab (_blank) or the same tab (_self)
• Default remains true (_blank) for backward compatibility

Test plan

• Default behavior opens in new tab (backward compatible)
• Setting IterableConfig.openLinksInNewTab = false opens in same tab (_self)
• TypeScript types are correct

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.43%. Comparing base (190a168) to head (c9c70d0).

Files with missing lines	Patch %	Lines
src/utils/IterableActionRunner.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #569      +/-   ##
==========================================
- Coverage   74.45%   74.43%   -0.02%     
==========================================
  Files          57       57              
  Lines        2736     2738       +2     
  Branches      798      815      +17     
==========================================
+ Hits         2037     2038       +1     
+ Misses        698      659      -39     
- Partials        1       41      +40     

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