feat: enhance TiptapToHTML to handle trailing <br> tags and add comprehensive tests

Author: agjs

CHANGELOG.md

@@ -2,10 +2,10 @@
 
 ## [1.21.0](https://github.com/Programmer-Network/yail/compare/yail-v1.20.0...yail-v1.21.0) (2025-12-03)
 
-
 ### Features
 
-* add News icon and update Filters component to conditionally render tags ([604607b](https://github.com/Programmer-Network/yail/commit/604607be21e7deacc659b8302fd8671f6560ed78))
+- add News icon and update Filters component to conditionally render tags
+  ([604607b](https://github.com/Programmer-Network/yail/commit/604607be21e7deacc659b8302fd8671f6560ed78))
 
 ## [1.20.0](https://github.com/Programmer-Network/yail/compare/yail-v1.19.0...yail-v1.20.0) (2025-12-02)