loadInstanceOptionsFromStack is not iso with loadInstanceOptionsFromDOM

[zatteo]

loadInstanceOptionsFromStack is used as an Oauth equivalent of loadInstanceOptionsFromDOM. But it is not equivalent.

@Ldoppea did a review of what is inside the result of loadInstanceOptionsFromDOM.

Legend :
🟡 manifest
🔴 settings
🟣 config
🟢 instance

{
    "app": {
        "editor": 🟡 WebappManifest.Editor,
        "icon": 🟡 WebappManifest.Icon,
        "name": 🟡 WebappManifest.Name,
        "prefix": 🟡 WebappManifest.NamePrefix,
        "slug": 🟡 WebappManifest.Slug
    },
    "capabilities": { // already good
        "file_versioning": true,
        "flat_subdomains": true,
        "can_auth_with_password": true,
        "can_auth_with_magic_links": false,
        "can_auth_with_oidc": false
    },
    "domain": 🟢 instance.ContextualDomain,
    "flags": {},
    "locale": 🔴settings.locale,
    "subdomain": 🟣config.GetConfig().Subdomains === config.FlatSubdomains ? "flat" : "nested",
    "token": "xxx", // we shouldn't need it here because the method is used by oauth clients that already have a token in their internal structure
    "tracking": 🔴settings.tracking,
    "cozyToken": "xxx", // we shouldn't need it here because the method is used by oauth clients that already have a token in their internal structure
    "cozyDomain": 🟢 instance.ContextualDomain,
    "cozyLocale": 🔴settings.locale,
    "cozyAppEditor": 🟡 WebappManifest.Editor,
    "cozyAppName": 🟡 WebappManifest.Name
    "cozyAppNamePrefix": 🟡 WebappManifest.NamePrefix,
    "cozyAppSlug": 🟡 WebappManifest.Slug,
    "cozyTracking": 🔴settings.tracking,
    "cozyIconPath": 🟡 WebappManifest.Icon,
    "cozySubdomainType": 🟣config.GetConfig().Subdomains === config.FlatSubdomains ? "flat" : "nested",
    "cozyDefaultWallpaper": "//claude.mycozy.cloud/assets/images/default-wallpaper.2302a3c8ec.jpg", // not useful
    "cozyFlags": "" // ??
}