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/database/MessageEntities.kt

@@ -3,6 +3,70 @@ package com.rosetta.messenger.database
 import androidx.room.*
 import kotlinx.coroutines.flow.Flow
 
+// ═══════════════════════════════════════════════════════════
+// 📌 PINNED MESSAGES
+// ═══════════════════════════════════════════════════════════
+
+/** Entity для закреплённых сообщений в чате (Telegram-style pinned messages) */
+@Entity(
+        tableName = "pinned_messages",
+        indices =
+                [
+                        Index(
+                                value = ["account", "dialog_key", "message_id"],
+                                unique = true
+                        ),
+                        Index(value = ["account", "dialog_key", "pinned_at"])]
+)
+data class PinnedMessageEntity(
+        @PrimaryKey(autoGenerate = true) val id: Long = 0,
+        @ColumnInfo(name = "account") val account: String,
+        @ColumnInfo(name = "dialog_key") val dialogKey: String,
+        @ColumnInfo(name = "message_id") val messageId: String,
+        @ColumnInfo(name = "pinned_at") val pinnedAt: Long = System.currentTimeMillis()
+)
+
+/** DAO для работы с закреплёнными сообщениями */
+@Dao
+interface PinnedMessageDao {
+
+    /** Закрепить сообщение (IGNORE если уже закреплено) */
+    @Insert(onConflict = OnConflictStrategy.IGNORE)
+    suspend fun insertPin(pin: PinnedMessageEntity): Long
+
+    /** Открепить конкретное сообщение */
+    @Query(
+            "DELETE FROM pinned_messages WHERE account = :account AND dialog_key = :dialogKey AND message_id = :messageId"
+    )
+    suspend fun removePin(account: String, dialogKey: String, messageId: String)
+
+    /** Получить все закреплённые сообщения диалога (Flow для реактивных обновлений) */
+    @Query(
+            """
+        SELECT * FROM pinned_messages 
+        WHERE account = :account AND dialog_key = :dialogKey
+        ORDER BY pinned_at DESC
+    """
+    )
+    fun getPinnedMessages(account: String, dialogKey: String): Flow<List<PinnedMessageEntity>>
+
+    /** Проверить, закреплено ли сообщение */
+    @Query(
+            "SELECT EXISTS(SELECT 1 FROM pinned_messages WHERE account = :account AND dialog_key = :dialogKey AND message_id = :messageId)"
+    )
+    suspend fun isPinned(account: String, dialogKey: String, messageId: String): Boolean
+
+    /** Открепить все сообщения диалога */
+    @Query("DELETE FROM pinned_messages WHERE account = :account AND dialog_key = :dialogKey")
+    suspend fun unpinAll(account: String, dialogKey: String): Int
+
+    /** Количество закреплённых сообщений в диалоге */
+    @Query(
+            "SELECT COUNT(*) FROM pinned_messages WHERE account = :account AND dialog_key = :dialogKey"
+    )
+    suspend fun getPinnedCount(account: String, dialogKey: String): Int
+}
+
 /** 🔥 Data class для статуса последнего сообщения */
 data class LastMessageStatus(
         @ColumnInfo(name = "from_me") val fromMe: Int,