EPUB conformance profile ignored in WebPub manifests

[sysint64]

Describe the bug

When loading a WebPub manifest that declares conformance to the EPUB profile via "conformsTo": "https://readium.org/webpub-manifest/profiles/epub", the publication does not behave like an EPUB. Instead, it's treated as a standard WebPub with limited functionality.

Issues observed

1. No user preferences available e.g.: Theme selection, letter spacing, text alignment, etc.
2. Location tracking behaves like WebPub instead of EPUB:
   • Location updates only trigger on full page changes
   • No location updates during in-page scrolling

Environment

• Confirmed in: Readium Test App
• Works correctly in: Throium Web

Example

Moby Dick on the publication server demonstrates the issue:
https://publication-server.readium.org/Z3M6Ly9yZWFkaXVtLXBsYXlncm91bmQtZmlsZXMvZGVtby9tb2J5LWRpY2suZXB1Yg/manifest.json

How to reproduce?

1. Load a WebPub manifest with the EPUB profile declaration, e.g. download and import https://publication-server.readium.org/Z3M6Ly9yZWFkaXVtLXBsYXlncm91bmQtZmlsZXMvZGVtby9tb2J5LWRpY2suZXB1Yg/manifest.json (streaming won't work as there is and issues with http range support)
2. Open the publication
3. Attempt to submit user preferences - it won't work
4. Observe location update behavior while scrolling

Readium version

3.3.0

OS version

iOS 18.5

Testing device

iPhone 16

Environment

macOS: 15.5
platform: arm64
carthage: 0.40.0
Xcode 16.3
Build version 16E140

Additional context

No response

[ddfreiling]

Might it be related to this, which I fixed in kotlin-toolkit? 🤔 Or maybe it's just to do with the example app.
readium/kotlin-toolkit#682

[sysint64]

@ddfreiling We tested this on our app and on the example app and they are both disregard conformsTo, I'll try your fix a bit later, thanks.