[Fixes #14070] Modify the default layer format image

[dsuren1]

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves issue #14070 by updating the default image format used for layers within the GeoNode application. The change aims to enhance image handling by switching to a more flexible and potentially more compatible image format for layer rendering.

Highlights

• Default Layer Format: Modified the default value for the DEFAULT_LAYER_FORMAT setting from "image/png" to "image/vnd.jpeg-png" in geonode/settings.py to address issue Change the default layer format #14070.

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[gemini-code-assist]

Code Review

This pull request updates the default layer format from image/png to image/vnd.jpeg-png. This is a good performance optimization for GeoNode instances using GeoServer, as it allows serving smaller JPEG tiles for opaque areas while still supporting transparency with PNG. My feedback includes a suggestion to add a comment explaining this vendor-specific format for better maintainability.

[cla-bot]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have the users @dsuren1 on file. In order for us to review and merge your code, please contact the project maintainers to get yourself added.