refactor: default settings for compression

[RaduCristianPopescu]

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• Does your code follow the WordPress' coding standards?
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Changes proposed in this Pull Request:

• Automatically applies DPR for retina-enabled images or small images under 150px.
• Changes speed-optimized compression to enable best format selection by default.
• Removes AVIF setting toggler.
• Adjust best format description.

Closes https://github.com/Codeinwp/optimole-service/issues/1513

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[Copilot]

Pull Request Overview

This PR refactors default settings for compression in Optimole to improve handling of retina images and AVIF format options. The changes modify how DPR (Device Pixel Ratio) is applied and update the user interface to reflect better default behaviors.

• Automatically applies DPR for retina-enabled images or small images under 150px
• Changes speed-optimized compression to enable best format selection by default
• Conditionally displays AVIF settings based on a feature flag

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
inc/url_replacer.php	Adds automatic DPR logic for retina images and small images
inc/admin.php	Updates localization with AVIF feature flag and improved descriptions
assets/src/dashboard/parts/connected/settings/Compression.js	Enables best format by default for speed optimization and conditionally shows AVIF settings

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[rodica-andronache]

@Soare-Robert-Daniel, from what I understand from "On a fresh new install with the wp plugin, when connecting the plugin, the best format should be on and active.", this option "Automatic Best Image Format Selection" should be enabled by default https://vertis.d.pr/i/vBJErc and the images should have f:best in the URL.
Is that how it should be?
From what I've tried, that's not happening. https://unmatched-ape-cf154f.vertisite.cloud/

[Soare-Robert-Daniel]

@rodica-andronache, you can check again for the f:best.

Here is an example: https://defaults.vertisite.cloud/hello-world/

[rodica-andronache]

it's working well

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🎉 This PR is included in version 4.1.0 🎉

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