feat: enhance message encryption and media file conversion with improved compression and base64 encoding

app/src/main/java/com/rosetta/messenger/crypto/MessageCrypto.kt

@@ -762,10 +762,14 @@ object MessageCrypto {
             val deflater = java.util.zip.Deflater()
             deflater.setInput(replyJson.toByteArray(Charsets.UTF_8))
             deflater.finish()
-            val compressedBuffer = ByteArray(replyJson.length * 2 + 100)
-            val compressedSize = deflater.deflate(compressedBuffer)
+            val outputStream = java.io.ByteArrayOutputStream()
+            val buffer = ByteArray(8192)
+            while (!deflater.finished()) {
+                val count = deflater.deflate(buffer)
+                outputStream.write(buffer, 0, count)
+            }
             deflater.end()
-            val compressed = compressedBuffer.copyOf(compressedSize)
+            val compressed = outputStream.toByteArray()
             
             // PBKDF2 key derivation (matching crypto-js: crypto.PBKDF2(password, 'rosetta', {keySize: 256/32, iterations: 1000}))
             // Используем generatePBKDF2Key() для совместимости с crypto-js (UTF-8 encoding)
@@ -789,8 +793,8 @@ object MessageCrypto {
             
             result
         } catch (e: Exception) {
-            // Fallback: return plaintext (for backwards compatibility)
-            replyJson
+            android.util.Log.e("MessageCrypto", "encryptReplyBlob failed", e)
+            throw e
         }
     }
     

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

@@ -172,7 +172,8 @@ object MediaUtils {
             val bytes = inputStream.readBytes()
             inputStream.close()
 
-            val base64 = Base64.encodeToString(bytes, Base64.NO_WRAP)
+            val mimeType = context.contentResolver.getType(uri) ?: "application/octet-stream"
+            val base64 = "data:$mimeType;base64," + Base64.encodeToString(bytes, Base64.NO_WRAP)
 
             base64
         } catch (e: Exception) {