feat: add character contacts

[ErikKalkoken]

This PR adds the character contacts feature:

• Shows all character contacts with standing
• For each contract shows category, contact labels and whether they are a NPC
• Contact list can be filtered by various topics and searched

Screenshot:

[codecov]

Codecov Report

❌ Patch coverage is 27.48092% with 570 lines in your changes missing coverage. Please review.
✅ Project coverage is 34.6%. Comparing base (72633a9) to head (1ec7c59).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/app/ui/charactercontacts.go	4.2%	366 Missing and 14 partials ⚠️
internal/app/storage/charactercontact.go	62.0%	26 Missing and 26 partials ⚠️
internal/app/testutil/factory.go	0.0%	43 Missing ⚠️
internal/app/characterservice/contacts.go	71.8%	15 Missing and 12 partials ⚠️
internal/app/contact.go	0.0%	26 Missing ⚠️
internal/app/storage/charactercontactlabel.go	69.2%	8 Missing and 8 partials ⚠️
internal/app/ui/desktopui.go	0.0%	5 Missing ⚠️
internal/app/characterservice/section.go	0.0%	4 Missing ⚠️
internal/app/ui/mobileui.go	0.0%	4 Missing ⚠️
internal/app/ui/updateticker.go	0.0%	4 Missing ⚠️
... and 3 more

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #413     +/-   ##
=======================================
- Coverage   34.7%   34.6%   -0.2%     
=======================================
  Files        246     251      +5     
  Lines      40128   40908    +780     
=======================================
+ Hits       13939   14168    +229     
- Misses     24073   24562    +489     
- Partials    2116    2178     +62     

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