fix(replay): Preserve queued foreground startup

Check Replay registration when the foreground callback executes so AppState catch-up can start Replay after registration. Cover both callback orderings with tests.

Refs JAVA-325
Co-Authored-By: Codex <noreply@openai.com>

Author: romtsn

sentry-android-replay/src/main/java/io/sentry/android/replay/ReplayIntegration.kt

@@ -167,10 +167,10 @@ public class ReplayIntegration(
   }
 
   override fun onAppForegrounded(startNewSession: Boolean) {
-    if (!isEnabled.get()) {
-      return
-    }
     enqueueOnMainThread {
+      if (!isEnabled.get()) {
+        return@enqueueOnMainThread
+      }
       if (startNewSession) {
         val isFullSession = sample(options.sessionReplay.sessionSampleRate)
         if (!isFullSession && !options.sessionReplay.isSessionReplayForErrorsEnabled) {
@@ -187,9 +187,6 @@ public class ReplayIntegration(
   }
 
   override fun onAppBackgrounded() {
-    if (!isEnabled.get()) {
-      return
-    }
     enqueueOnMainThread { pauseInternal() }
   }
 

sentry-android-replay/src/test/java/io/sentry/android/replay/ReplayIntegrationTest.kt

@@ -226,14 +226,23 @@ class ReplayIntegrationTest {
   }
 
   @Test
-  fun `lifecycle callbacks before register are not enqueued`() {
-    val mainLooperHandler = mock<MainLooperHandler>()
-    val replay = fixture.getSut(context, mainLooperHandler = mainLooperHandler)
+  fun `foreground before register does nothing`() {
+    val replay = fixture.getSut(context)
 
     replay.onAppForegrounded(true)
-    replay.onAppBackgrounded()
 
-    verify(mainLooperHandler, never()).post(any())
+    assertThat(replay.isRecording).isFalse()
+  }
+
+  @Test
+  fun `foreground queued before register starts replay after register`() {
+    val replay = fixture.getSut(context, mainLooperHandler = MainLooperHandler())
+
+    replay.onAppForegrounded(true)
+    replay.register(fixture.scopes, fixture.options)
+    shadowOf(Looper.getMainLooper()).idle()
+
+    assertThat(replay.isRecording).isTrue()
   }
 
   @Test