Refactor image blurring to use RenderScript for improved performance and quality

- Replaced custom fast blur implementation with RenderScript-based Gaussian blur in BlurredAvatarBackground and AppearanceScreen.
- Updated image processing logic to scale down bitmaps before applying blur for efficiency.
- Simplified blur logic by removing unnecessary pixel manipulation methods.
- Enhanced media preview handling in OtherProfileScreen to utilize new Gaussian blur function.
- Improved code readability and maintainability by consolidating blur functionality.

app/src/main/java/com/rosetta/messenger/data/MessageRepository.kt

@@ -230,16 +230,16 @@ class MessageRepository private constructor(private val context: Context) {
         _newMessageEvents.tryEmit(dialogKey)
     }
 
-    /** Send a system message from "Rosetta Updates" account */
-    suspend fun addUpdateSystemMessage(messageText: String) {
-        val account = currentAccount ?: return
-        val privateKey = currentPrivateKey ?: return
+    /** Send a system message from "Rosetta Updates" account. Returns messageId or null. */
+    suspend fun addUpdateSystemMessage(messageText: String): String? {
+        val account = currentAccount ?: return null
+        val privateKey = currentPrivateKey ?: return null
 
         val encryptedPlainMessage =
                 try {
                     CryptoManager.encryptWithPassword(messageText, privateKey)
                 } catch (_: Exception) {
-                    return
+                    return null
                 }
 
         val messageId = UUID.randomUUID().toString().replace("-", "").take(32)
@@ -265,7 +265,7 @@ class MessageRepository private constructor(private val context: Context) {
                         )
                 )
 
-        if (inserted == -1L) return
+        if (inserted == -1L) return null
 
         val existing = dialogDao.getDialog(account, SYSTEM_UPDATES_PUBLIC_KEY)
         dialogDao.insertDialog(
@@ -286,6 +286,7 @@ class MessageRepository private constructor(private val context: Context) {
 
         dialogDao.updateDialogFromMessages(account, SYSTEM_UPDATES_PUBLIC_KEY)
         _newMessageEvents.tryEmit(dialogKey)
+        return messageId
     }
 
     /**
@@ -295,12 +296,23 @@ class MessageRepository private constructor(private val context: Context) {
     suspend fun checkAndSendVersionUpdateMessage() {
         val account = currentAccount ?: return
         val prefs = context.getSharedPreferences("rosetta_system_${account}", Context.MODE_PRIVATE)
-        val lastNoticeVersion = prefs.getString("lastNoticeVersion", "") ?: ""
+        val lastNoticeKey = prefs.getString("lastNoticeKey", "") ?: ""
         val currentVersion = com.rosetta.messenger.BuildConfig.VERSION_NAME
+        val currentKey = "${currentVersion}_${ReleaseNotes.noticeHash}"
 
-        if (lastNoticeVersion != currentVersion) {
-            addUpdateSystemMessage(ReleaseNotes.getNotice(currentVersion))
-            prefs.edit().putString("lastNoticeVersion", currentVersion).apply()
+        if (lastNoticeKey != currentKey) {
+            // Delete the previous message for this version (if any)
+            val prevMessageId = prefs.getString("lastNoticeMessageId_$currentVersion", null)
+            if (prevMessageId != null) {
+                messageDao.deleteMessage(account, prevMessageId)
+                dialogDao.updateDialogFromMessages(account, SYSTEM_UPDATES_PUBLIC_KEY)
+            }
+
+            val messageId = addUpdateSystemMessage(ReleaseNotes.getNotice(currentVersion))
+            prefs.edit()
+                .putString("lastNoticeKey", currentKey)
+                .putString("lastNoticeMessageId_$currentVersion", messageId)
+                .apply()
         }
     }
 

app/src/main/java/com/rosetta/messenger/data/ReleaseNotes.kt

@@ -28,4 +28,8 @@ object ReleaseNotes {
 
     fun getNotice(version: String): String =
         RELEASE_NOTICE.replace(VERSION_PLACEHOLDER, version)
+
+    /** Hash of current notice text — used to re-send if text changed within the same version */
+    val noticeHash: String
+        get() = RELEASE_NOTICE.hashCode().toString(16)
 }