Enhance slugify function for Turkish characters

[Hakan-Soysal]

Added Turkish character mappings to the slugify function to handle Turkish characters properly.

Summary

Updated the slugify function to provide robust support for Turkish localization. This change introduces a character mapping layer that transforms Turkish-specific characters (like ğ, ş, ı) into their ASCII equivalents before the regex cleanup. It also ensures that the " & " symbol is semantically preserved as "-and-" instead of being stripped out.

Checklist

• Documented steps to test (below)
• Drafted “how to use” docs (if this adds new behavior)
• Backwards compatibility considered (notes if applicable)

Documented steps to test

1. Test Turkish Mapping: Call slugify("Eskişehir & İstanbul").

Expected Result: "eskisehir-and-istanbul"

2. Test Semantic Preservation: Call slugify("Bread & Butter").

Expected Result: "bread-and-butter"

3. Test Casing and Symbols: Call slugify("Ilık Bir Gün @2024!").

Expected Result: "ilik-bir-gun-2024" (Ensures the dotless 'I' maps to 'i' and non-alphanumerics are cleaned).

4. Test Edge Trimming: Call slugify("---test---").

Expected Result: "test"

Notes for reviewers

1. Character Map: Uses a Record<string, string> to explicitly handle ı/İ, ş/Ş, ğ/Ğ, ü/Ü, ö/Ö, and ç/Ç.
2. Pipeline Order: * Maps Turkish characters first.
   • Converts to lowercase.
   • Converts & to -and-.
   • Strips remaining non-alphanumeric characters.
   • Trims leading/trailing hyphens.