[fenix] Close https://github.com/mozilla-mobile/fenix/issues/26198: Add debounce to account manager syncs

app/src/main/java/org/mozilla/fenix/HomeActivity.kt

@@ -340,8 +340,13 @@ open class HomeActivity : LocaleAwareAppCompatActivity(), NavHostActivity {
             lifecycleScope.launch {
                 // If we're authenticated, kick-off a sync and a device state refresh.
                 components.backgroundServices.accountManager.authenticatedAccount()?.let {
+                    val syncReason = when (isVisuallyComplete) {
+                        true -> SyncReason.User
+                        false -> SyncReason.Startup
+                    }
+
                     components.backgroundServices.accountManager.syncNow(
-                        SyncReason.Startup,
+                        reason = syncReason,
                         debounce = true
                     )
                 }

app/src/main/java/org/mozilla/fenix/home/recentsyncedtabs/RecentSyncedTabFeature.kt

@@ -60,7 +60,11 @@ class RecentSyncedTabFeature(
                     // Sync tabs storage will fail to retrieve tabs aren't refreshed, as that action
                     // is what populates the device constellation state
                     accountManager.withConstellation { refreshDevices() }
-                    accountManager.syncNow(SyncReason.User, customEngineSubset = listOf(SyncEngine.Tabs))
+                    accountManager.syncNow(
+                        reason = SyncReason.User,
+                        debounce = true,
+                        customEngineSubset = listOf(SyncEngine.Tabs),
+                    )
                 }
             }.launchIn(coroutineScope)
     }

app/src/test/java/org/mozilla/fenix/home/recentsyncedtabs/RecentSyncedTabFeatureTest.kt

@@ -128,7 +128,7 @@ class RecentSyncedTabFeatureTest {
 
         verify { appStore.dispatch(AppAction.RecentSyncedTabStateChange(RecentSyncedTabState.Loading)) }
         coVerify { accountManager.withConstellation { refreshDevices() } }
-        coVerify { accountManager.syncNow(reason = SyncReason.User, debounce = false, customEngineSubset = listOf(SyncEngine.Tabs)) }
+        coVerify { accountManager.syncNow(reason = SyncReason.User, debounce = true, customEngineSubset = listOf(SyncEngine.Tabs)) }
     }
 
     @Test