Expand conversion of web-unsafe image formats (JPEG XL)

[swissspidy]

• Adds a new convertUnsafe toggle
• Adds a new useAi toggle for the image caption generation
• Allows automatically converting unsafe images like JPEG XL, TIFF, or — like already present — HEIC.

Apparently if the browser doesn't support the mime type when adding a file to an <input>, the mime type could be empty.

Weirdly, in my local testing this wasn't the case in Chromium, but somehow was on CI. So maybe it also has to do with the OS / environment (CI uses wp-env). Manually providing the mime type fixes this, but begs the question whether further testing is required in that regard. An empty mime type should just fall through to simple upload though.

Fixes #656

[github-actions]

Size Change: +394 B (+0.01%)

Total Size: 7.31 MB

Filename	Size	Change
build/media-experiments.js	78.9 kB	+260 B (+0.33%)
build/view-upload-request.js	18.9 kB	+174 B (+0.93%)

ℹ️ View Unchanged

Filename	Size	Change
build/100.js	89.6 kB	0 B
build/699.js	2.35 MB	0 B
build/ai.worker.js	178 kB	0 B
build/blurhash.worker.js	3.23 kB	0 B
build/canvas.worker.js	2.79 kB	0 B
build/chunk-ffmpeg.js	5.92 kB	0 B
build/chunk-selfie-segmentation.js	16.3 kB	0 B
build/dominant-color.worker.js	4.45 kB	0 B
build/ffmpeg.js	1.09 kB	0 B
build/heif.worker.js	450 kB	0 B
build/media-experiments-blocks-rtl.css	297 B	0 B
build/media-experiments-blocks.css	296 B	0 B
build/media-experiments-rtl.css	1.03 kB	0 B
build/media-experiments.css	1.03 kB	0 B
build/pdf.js	579 B	0 B
build/subtitles.js	850 B	0 B
build/view-upload-request-view-rtl.css	697 B	0 B
build/view-upload-request-view.css	699 B	0 B
build/vips-heif.********.wasm	1.27 MB	0 B
build/vips-jxl.********.wasm	800 kB	0 B
build/vips.********.wasm	2 MB	0 B
build/vips.worker.js	37.9 kB	-40 B (-0.11%)

_{compressed-size-action}