fix(android): remove PushInterceptReceiver to prevent duplicate push notifications

[akifarhan]

Problem

On Android devices that still trigger the legacy com.google.android.c2dm.intent.RECEIVE broadcast (older Android versions and certain OEM builds), Intercom push notifications are displayed twice.

Root Cause

The merged Android manifest ends up with two simultaneous Intercom push handlers:

Handler	Registered by	Trigger
io.maido.intercom.PushInterceptReceiver	intercom_flutter plugin manifest	com.google.android.c2dm.intent.RECEIVE (legacy C2DM broadcast)
io.intercom.android.sdk.fcm.IntercomFcmMessengerService	intercom-sdk-fcm AAR (transitive dep of intercom-sdk)	com.google.firebase.MESSAGING_EVENT (modern Firebase path)

On affected devices, both handlers receive the same push payload and independently call handlePush(), resulting in two notifications being displayed.

IntercomFcmMessengerService is included automatically as a transitive dependency whenever intercom-sdk is used — meaning both handlers are always present when initSdk() is called in the Application class per the recommended setup.

Fix

Remove PushInterceptReceiver from the plugin's AndroidManifest.xml. IntercomFcmMessengerService (registered by the native SDK's own AAR) is the intended modern handler and covers all cases including background and killed-state delivery when initSdk() is called in the Application class.

Removed from android/src/main/AndroidManifest.xml:

<receiver
    android:name="io.maido.intercom.PushInterceptReceiver"
    android:exported="true"
    android:permission="com.google.android.c2dm.permission.SEND">
    <intent-filter>
        <action android:name="com.google.android.c2dm.intent.RECEIVE" />
    </intent-filter>
</receiver>

PushInterceptReceiver.kt can also be removed entirely as it becomes unreachable.

Testing

Tested on an affected device (OEM build still triggering the C2DM broadcast):

• Before fix: every Intercom push notification displayed twice
• After fix: single notification displayed correctly
• Background and killed-state push delivery unaffected