Thanks for testing all the steps. Since you already performed Windows 11 25H2 repair reinstall and Microsoft Store is still showing a blank screen, this is likely not a Store app package issue.
From your log, the important clue is:
net start wlidsvc
System error 5 has occurred. Access is denied.
Microsoft Account Sign-in Assistant (wlidsvc) is required by Microsoft Store for account authentication. Please try repairing its permissions:
Open Command Prompt as Administrator.
Run these commands one by one:
sc sdset wlidsvc D:(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWRPWPDTLOCRRC;;;AU)
Restart the PC, then run:
net start wlidsvc
If the service starts successfully, test Microsoft Store again.