feat: Enhance avatar management with detailed logging and error handling

app/src/main/java/com/rosetta/messenger/utils/AvatarFileManager.kt

@@ -31,15 +31,23 @@ object AvatarFileManager {
      * @return Путь к файлу (формат: "a/md5hash")
      */
     fun saveAvatar(context: Context, base64Image: String, entityId: String): String {
+        android.util.Log.d("AvatarFileManager", "💾 saveAvatar called")
+        android.util.Log.d("AvatarFileManager", "📊 Base64 length: ${base64Image.length}")
+        android.util.Log.d("AvatarFileManager", "👤 Entity ID: ${entityId.take(16)}...")
+        
         // Генерируем путь как в desktop версии
         val filePath = generateMd5Path(base64Image, entityId)
+        android.util.Log.d("AvatarFileManager", "🔗 Generated file path: $filePath")
         
         // Шифруем данные с паролем "rosetta-a"
+        android.util.Log.d("AvatarFileManager", "🔐 Encrypting with password...")
         val encrypted = CryptoManager.encryptWithPassword(base64Image, AVATAR_PASSWORD)
+        android.util.Log.d("AvatarFileManager", "✅ Encrypted length: ${encrypted.length}")
         
         // Сохраняем в файловую систему
         val dir = File(context.filesDir, AVATAR_DIR)
         dir.mkdirs()
+        android.util.Log.d("AvatarFileManager", "📁 Base dir: ${dir.absolutePath}")
         
         // Путь формата "a/md5hash" -> создаем подпапку "a"
         val parts = filePath.split("/")
@@ -48,11 +56,14 @@ object AvatarFileManager {
             subDir.mkdirs()
             val file = File(subDir, parts[1])
             file.writeText(encrypted)
+            android.util.Log.d("AvatarFileManager", "💾 Saved to: ${file.absolutePath}")
         } else {
             val file = File(dir, filePath)
             file.writeText(encrypted)
+            android.util.Log.d("AvatarFileManager", "💾 Saved to: ${file.absolutePath}")
         }
         
+        android.util.Log.d("AvatarFileManager", "✅ Avatar saved successfully")
         return filePath
     }