add guard on /profile/card for solid:oidcIssuer triple #2239

Environment

file-system implementation

• v7
• node 22
• npm 10
  and any PIVOT that wraps CSS: example https://solidcommunity.net

Description

/profile/card can be deleted/edited without any control (PUT/POST/PATCH/DELETE).
When /profile/card is either

• deleted
• void
• miss the solid:issuer guard on server IDP used at account creation
• content is not text/turtle RDF
  No user recovery possible and user cannot log anymore by using available authentication library

Real reported cases

Some users

• deleted /profile/card
• PUT blank content
• PUT application/ld+json
  The only solution is to manually edit the server data

Solution

Introduce a guard on /profile/card for

• solid:oidcIssuer triple
• and text/turtle contentType for file-system implementation