Add support for JXL

[mickael-menu]

Added

Shared

• Added support for JXL (JPEG XL) bitmap images. JXL is decoded natively on iOS 17+.

[Copilot]

Pull request overview

This PR adds support for JXL (JPEG XL) bitmap images, which are natively decoded on iOS 17+. The implementation systematically adds JXL support across all relevant components of the format detection and parsing system.

Changes:

• Added JXL format specification, media type definition, and bitmap classification
• Integrated JXL into format sniffers for bitmap and comic archive detection
• Updated image parser to recognize JXL files
• Added comprehensive test coverage for JXL format detection
• Fixed duplicate test assertion for TIFF media type
• Updated CI workflow device configuration (unrelated change)

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
CHANGELOG.md	Documents JXL support addition with iOS 17+ native decoding note
.github/workflows/checks.yml	Changes CI device from "iPhone 17" to "iPad (A16)"
Sources/Shared/Toolkit/Format/Format.swift	Adds JXL format specification constant
Sources/Shared/Toolkit/Format/MediaType.swift	Adds JXL media type constant and includes it in bitmap classification
Sources/Shared/Toolkit/Format/Sniffers/BitmapFormatSniffer.swift	Adds JXL format detection by extension and media type
Sources/Shared/Toolkit/Format/Sniffers/ComicFormatSniffer.swift	Includes JXL in comic archive bitmap extensions
Sources/Streamer/Parser/Image/ImageParser.swift	Adds JXL to supported bitmap specifications for parsing
Tests/SharedTests/Toolkit/Format/FormatSniffersTests.swift	Adds test cases for JXL format sniffing
Tests/SharedTests/Toolkit/Format/MediaTypeTests.swift	Adds JXL bitmap test and fixes duplicate TIFF assertion

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