Check from_name in smtp sent emails

[pierre-b]

Add integration tests to verify from_name is correctly included in SMTP email headers by checking raw Mailhog messages.

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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 89.18919% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.54%. Comparing base (9fb474b) to head (29c0f02).
⚠️ Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
internal/service/email_service.go	89.18%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #66      +/-   ##
==========================================
+ Coverage   81.51%   81.54%   +0.02%     
==========================================
  Files         148      148              
  Lines       27941    27978      +37     
==========================================
+ Hits        22777    22815      +38     
+ Misses       4081     4076       -5     
- Partials     1083     1087       +4     

Flag	Coverage Δ
unit	81.54% <89.18%> (+0.02%)	⬆️

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