Update check runs on every cold start instead of a 6h throttle

One GET to our own Gitea per launch is nothing, and it makes the updater
predictable: publish a release, users see the banner on next open.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

features/home/impl/src/main/kotlin/io/element/android/features/home/impl/roomlist/RoomListPresenter.kt

@@ -230,16 +230,13 @@ class RoomListPresenter(
             }
         }
 
-        // Blap: in-app update check — throttled, so most launches make no network call.
+        // Blap: in-app update check — every cold start (one cheap GET to our own Gitea);
+        // an update is offered the first launch after it's published, no waiting window.
         var blapUpdateInfo by remember { mutableStateOf<BlapUpdateInfo?>(null) }
         var blapUpdateDownloading by remember { mutableStateOf(false) }
         var blapUpdateFailed by remember { mutableStateOf(false) }
         LaunchedEffect(Unit) {
-            val now = System.currentTimeMillis()
-            val lastCheck = sharedPreferences.getLong(BLAP_UPDATE_LAST_CHECK_KEY, 0L)
-            if (now - lastCheck < BLAP_UPDATE_CHECK_INTERVAL_MS) return@LaunchedEffect
             val info = blapUpdateChecker.check()
-            sharedPreferences.edit { putLong(BLAP_UPDATE_LAST_CHECK_KEY, now) }
             if (info != null && info.version != sharedPreferences.getString(BLAP_UPDATE_DISMISSED_KEY, null)) {
                 blapUpdateInfo = info
             }
@@ -443,9 +440,7 @@ class RoomListPresenter(
         const val BLAP_VOICE_ROOMS_KEY = "blap_voice_room_ids"
         const val BLAP_SPACE_OWNED_KEY = "blap_space_owned_room_ids"
         const val BLAP_NESTED_SPACES_KEY = "blap_nested_space_ids"
-        const val BLAP_UPDATE_LAST_CHECK_KEY = "blap_update_last_check"
         const val BLAP_UPDATE_DISMISSED_KEY = "blap_update_dismissed_version"
-        const val BLAP_UPDATE_CHECK_INTERVAL_MS = 6 * 60 * 60 * 1000L
     }
 
     @Composable