PNG getting Converted to JPG when selecting Images from Gallery

When using the Cordova Camera plugin with the encodingType option as JPEG,

I noticed that when selecting a PNG image from the gallery, the plugin modifies both the file name and type, converting the image to JPG if any scaling or modifications are applied.

### Expected Behavior:

- The file name may change due to processing, but the original image format (PNG) should be retained unless explicitly converted by the user.

### Observed Behavior:

- When a PNG image is selected, the plugin automatically converts it to JPG after applying modifications (e.g., scaling).
- The encoding type seems to be applied regardless of the source image format, leading to unexpected format conversion.

### Questions:

- Is this the expected behavior?
- Is there a specific reason for converting PNG images to JPG?
- Can the plugin be modified to retain the original image format when selecting images from the gallery?

Start by tracing the Cordova Camera plugin's gallery-selection path and how encodingType is applied when scaling or modifying an image. Reproduce the PNG-selection case, then verify that the output keeps PNG format and naming unless the user explicitly requests JPEG conversion.

Written by the indexing model from the issue text.