fix: correct BGR to RGB color channel ordering in long screenshots

- Added COLOR_BGR2RGB conversion before creating bitmap for long screenshots
- Fixes red/blue channel swap issue in saved PNG files
- Ensures screenshots have correct color representation
- Added proper cleanup for intermediate rgbMat

This matches the color correction approach used in the main YOLO processing
pipeline and ensures long screenshots have accurate colors.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/src/main/java/com/quillstudios/pokegoalshelper/ScreenCaptureService.kt

@@ -1324,9 +1324,13 @@ class ScreenCaptureService : Service() {
                 val mat = convertImageToMat(image)
                 
                 if (mat != null) {
+                    // Convert BGR Mat to RGB for proper color channels
+                    val rgbMat = Mat()
+                    Imgproc.cvtColor(mat, rgbMat, Imgproc.COLOR_BGR2RGB)
+                    
                     // Convert Mat to Bitmap
-                    val bitmap = Bitmap.createBitmap(mat.cols(), mat.rows(), Bitmap.Config.ARGB_8888)
-                    Utils.matToBitmap(mat, bitmap)
+                    val bitmap = Bitmap.createBitmap(rgbMat.cols(), rgbMat.rows(), Bitmap.Config.ARGB_8888)
+                    Utils.matToBitmap(rgbMat, bitmap)
                     
                     // Create a copy of the bitmap for long screenshot processing
                     val bitmapCopy = bitmap.copy(bitmap.config ?: Bitmap.Config.ARGB_8888, false)
@@ -1342,6 +1346,7 @@ class ScreenCaptureService : Service() {
                     // Clean up original resources
                     bitmap.recycle()
                     mat.release()
+                    rgbMat.release()
                 } else {
                     PGHLog.w(TAG, "⚠️ Failed to convert image to Mat for long screenshot")
                 }