Fix TransactionTooLargeException in QRCodeFullscreenActivity

- Remove bitmap from Intent extras to prevent TransactionTooLargeException
- Pass only QR text through Intent and regenerate bitmap in fullscreen activity
- Add QR code generation logic to QRCodeFullscreenActivity
- Update createIntent method signature to only accept QR text
- Fixes crash when launching fullscreen QR viewer with large bitmaps

This resolves the 800KB+ data parcel size issue that was causing
the activity to fail to launch.

app/src/main/java/com/futo/platformplayer/activities/PolycentricBackupActivity.kt

@@ -106,7 +106,7 @@ class PolycentricBackupActivity : AppCompatActivity() {
                 
                 // Add click listener to open QR code in fullscreen
                 _imageQR.setOnClickListener {
-                    val intent = QRCodeFullscreenActivity.createIntent(this@PolycentricBackupActivity, pair.second, _exportBundle)
+                    val intent = QRCodeFullscreenActivity.createIntent(this@PolycentricBackupActivity, _exportBundle)
                     startActivity(intent)
                 }
             } catch (e: Exception) {

app/src/main/java/com/futo/platformplayer/activities/QRCodeFullscreenActivity.kt

@@ -2,7 +2,9 @@ package com.futo.platformplayer.activities
 
 import android.content.Context
 import android.graphics.Bitmap
+import android.graphics.Color
 import android.os.Bundle
+import android.util.TypedValue
 import android.view.View
 import android.widget.ImageButton
 import android.widget.ImageView
@@ -10,15 +12,18 @@ import androidx.appcompat.app.AppCompatActivity
 import com.futo.platformplayer.R
 import com.futo.platformplayer.setNavigationBarColorAndIcons
 import com.futo.platformplayer.states.StateApp
+import com.google.zxing.BarcodeFormat
+import com.google.zxing.EncodeHintType
+import com.google.zxing.MultiFormatWriter
+import com.google.zxing.common.BitMatrix
+import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel
 
 class QRCodeFullscreenActivity : AppCompatActivity() {
     companion object {
-        private const val EXTRA_QR_BITMAP = "qr_bitmap"
         private const val EXTRA_QR_TEXT = "qr_text"
         
-        fun createIntent(context: Context, qrBitmap: Bitmap, qrText: String): android.content.Intent {
+        fun createIntent(context: Context, qrText: String): android.content.Intent {
             return android.content.Intent(context, QRCodeFullscreenActivity::class.java).apply {
-                putExtra(EXTRA_QR_BITMAP, qrBitmap)
                 putExtra(EXTRA_QR_TEXT, qrText)
             }
         }
@@ -33,16 +38,24 @@ class QRCodeFullscreenActivity : AppCompatActivity() {
         setContentView(R.layout.activity_qr_code_fullscreen)
         setNavigationBarColorAndIcons()
 
-        val qrBitmap = intent.getParcelableExtra<Bitmap>(EXTRA_QR_BITMAP)
         val qrText = intent.getStringExtra(EXTRA_QR_TEXT)
 
         val imageQR = findViewById<ImageView>(R.id.image_qr_fullscreen)
         val buttonBack = findViewById<ImageButton>(R.id.button_back_fullscreen)
         val buttonClose = findViewById<ImageButton>(R.id.button_close_fullscreen)
 
-        // Set the QR code image
-        qrBitmap?.let { bitmap ->
-            imageQR.setImageBitmap(bitmap)
+        // Generate QR code bitmap from text
+        qrText?.let { text ->
+            try {
+                val dimension = TypedValue.applyDimension(
+                    TypedValue.COMPLEX_UNIT_DIP, 300f, resources.displayMetrics
+                ).toInt()
+                val qrBitmap = generateQRCode(text, dimension, dimension)
+                imageQR.setImageBitmap(qrBitmap)
+            } catch (e: Exception) {
+                // If QR generation fails, show error or fallback
+                imageQR.setImageResource(R.drawable.ic_qr)
+            }
         }
 
         // Set click listeners
@@ -59,4 +72,26 @@ class QRCodeFullscreenActivity : AppCompatActivity() {
             finish()
         }
     }
+
+    private fun generateQRCode(content: String, width: Int, height: Int): Bitmap {
+        val hints = java.util.EnumMap<EncodeHintType, Any>(EncodeHintType::class.java)
+        hints[EncodeHintType.ERROR_CORRECTION] = ErrorCorrectionLevel.M
+        hints[EncodeHintType.MARGIN] = 1
+        
+        val bitMatrix = MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints)
+        return bitMatrixToBitmap(bitMatrix)
+    }
+
+    private fun bitMatrixToBitmap(matrix: BitMatrix): Bitmap {
+        val width = matrix.width
+        val height = matrix.height
+        val bmp = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565)
+
+        for (x in 0 until width) {
+            for (y in 0 until height) {
+                bmp.setPixel(x, y, if (matrix[x, y]) Color.BLACK else Color.WHITE)
+            }
+        }
+        return bmp
+    }
 }