If the in-place repair broke the store then I would roll back the upgrade then try upgrading again perhaps to 24H2 first then to 25H2, otherwise update 23H2 to the most recent build then upgrade to 25H2.
Yes. You may try rolling back to 23H2 and do the in-place upgrade again. Note that the option to go back to the previous version will be available for 10 days from the date of the upgrade.
If nothing works, we can try to fix the Microsoft Store app by installing it using the .msixbundle package.