fix(push): use onNewRegistrationToken instead of activate() on FCM token refresh

[maratal]

Summary

• Replaces push.activate() in onNewToken with push.getActivationContext().onNewRegistrationToken(RegistrationToken.Type.FCM, token)
• activate() triggers a full device registration flow (CalledActivate state machine event), which is wrong for a token refresh
• onNewRegistrationToken fires GotPushDeviceDetails — updating the stored token and re-registering with Ably only if the device is already activated
• Adds missing import io.ably.lib.types.RegistrationToken

🤖 Generated with Claude Code

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