Fetch OIDC profile pictures server-side when URL requires authentication - #510
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Some OIDC providers (e.g. Microsoft Entra ID) return a profile picture URL that requires a Bearer token to access. The browser cannot attach auth headers to
<img>tags, resulting in a 401.This change fetches the picture server-side during the OIDC callback using the access token already available from the auth code grant. If the response is an image, it's converted to a base64 data URI and stored in the session. If the fetch fails or the content isn't an image, it falls back to the original URL.
Fixes #326