What endorsements does a student pilot need to practice maneuvers solo with no limitations on distance from the airport?
In my opinion, I think the wording of 61.93(a)(i) is pretty clear.  Anytime a student pilot flies more than 25 NM from their home airfield they will need an endorsement.
I don't know where you are based at.  At my home airfield, all the practice areas are within the 25 NM radius of the airfield.
If a student pilot gets a little outside of the 25NM radius then I would tend to belief they have violated the wording of the regulations.  If the student pilot is performing maneuvers in the practice area and accidentally exceeds that radius I don't believe they violated the intent of the regulation but the student pilot should be cautioned to stay within the defined radius.
This is at the heart of FAA's compliance philosophy.
https://www.faa.gov/about/initiatives/cp/media/CP_Brochure.pdf