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Mixin to handle profile_picture serialization for WebSocket compatibility.

This mixin adds a SerializerMethodField for profile_picture that converts ImageFieldFile objects to URL strings, making them JSON serializable for WebSocket consumers.

The mixin intelligently handles profile pictures from IAMUserDetail by:

1. Accessing the related details queryset on the IAMUser model
2. Extracting the ImageFieldFile from the first detail record
3. Converting it to a URL string for JSON serialization

Usage:

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class MyUserSerializer(ProfilePictureMixin, serializers.ModelSerializer):
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    class Meta:
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        model = User
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        fields = ['id', 'username', 'profile_picture', ...]

Note:

• This mixin expects the model to have a details related manager
• The related detail should have a profile_picture ImageField
• Returns None if no profile picture is found or an error occurs

Email of the co-creator. Required if user is not set.

Role of the co-creator in the publication

• owner - Owner
• admin - Admin
• editor - Editor
• viewer - Viewer

• not_started - Not Started
• in_progress - In Progress
• completed - Completed
• failed - Failed