Is the fiancé entitled to recover the entire shabka upon the annulment of the engagement from his side, and what is the fiancée's right in this case, and is that considered an infringement of her right?

The Mahr (dower) is not due except upon a valid marriage contract. So, if the suitor pays a portion of it and then dissolves the engagement before the contract, the woman has no right to it. This is agreed upon. The "shabka" (engagement jewelry) is considered part of the Mahr by custom and must be returned to the suitor if he dissolves the engagement before the contract. It is not just for the fiancée to keep it under the pretext of psychological harm.