Introduce Announcement enum.

features/announcement/api/src/main/kotlin/io/element/android/features/announcement/api/Announcement.kt

@@ -0,0 +1,12 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.features.announcement.api
+
+enum class Announcement {
+    Space,
+}

features/announcement/api/src/main/kotlin/io/element/android/features/announcement/api/AnnouncementService.kt

@@ -11,7 +11,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 
 interface AnnouncementService {
-    suspend fun onEnteringSpaceTab()
+    suspend fun showAnnouncement(announcement: Announcement)
 
     @Composable
     fun Render(