RootFlowNodeTest was declaring its own no-op fake, while the oauth test
module already provides one. Use it, and move it out of the customtab
package, since it is not specific to the custom tabs.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Document OAuthIntentResolver and OAuthActionFlow along with their members.
OAuthActionFlow now explains why it exists rather than the result simply being
returned: the activity that receives the redirect and the login screen waiting for
it are not in the same navigation subtree.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Benoit Marty
Jorge Martín