Open steps:

• fix model loading (all books seem to load as modonomicon purple, including leaflets)
• Fix frame rendering
• Fix custom icon rendering
• fix image page rendering
• test server + client
• Check Couldn't parse data file 'modonomicon:crafting/demobook' from 'modonomicon:recipe/crafting/demobook.json': DataResult.Error['List is too short: 0, expected range [1-9]']
• Test Fabric
• fix fabric multiblock in-world preview
• fix all modloaders multiblock in-world progress bar (likely needs some GUI render state setup - just black)
  • render state setup is fine, it seems to be something with the calculation of the width, or color or similar
• fix fabric model loading
• leaflet shows add bookmark button