feat: process New Block Editor media uploads with app Media settings

[dcalhoun]

Description

Ref CMM-1249. Ref CMM-2155.

Integrates GutenbergKit's native media upload pipeline (wordpress-mobile/GutenbergKit#357) so device media picked in the New Block Editor (NBE) is processed natively before upload, honoring the app's Media settings: Optimize Images, Max Image Upload Size, Image Quality, Max Video Upload Size, and Remove Location From Media. Previously these uploads went directly from the WebView to the REST API with no processing, bypassing the settings the legacy editor and My Site > Media already honor.

How it works

• GBKMediaUploadProcessor implements GutenbergKit's new MediaUploadDelegate. When the editor uploads a device file, GutenbergKit's localhost upload server hands the staged file to processFile, which reuses MediaURLExporter with the same option mapping as MediaImportService:
  • Images are resized/recompressed per the Optimize Images settings, GPS EXIF is stripped per Remove Location, and non-web-safe formats (e.g. HEIC) are converted to JPEG, mirroring ItemProviderMediaExporter.
  • Videos are transcoded per the Max Video Upload Size preset, with the free-plan duration limit enforced (videoLimitExceeded surfaces WordPress's "requires a paid plan" message in the editor).
  • GIFs and non-media files pass through untouched (GutenbergKit forwards the original bytes verbatim); disallowed file extensions are rejected with the standard localized error.
  • When processing would be a no-op (optimization and location stripping disabled, web-safe format), the original file passes through without re-encoding.
• Upload itself still uses GutenbergKit's default uploader, which relays the raw WordPress REST response to the editor, so attachment objects, sub-sizes, and error notices behave identically to a direct upload.
• Wired unconditionally in PostGBKEditorViewController (covers posts, pages, and custom post types). If GutenbergKit's upload server cannot start, it degrades gracefully to the standard WebView upload path.

Notes

• Modules/Package.swift temporarily points at the pr-build/357 GutenbergKit snapshot; it must be swapped to a tagged release once feat: proxy media uploads through native delegate for processing GutenbergKit#357 ships.
• Uploaded attachments are not inserted into the local Core Data Media store, so My Site > Media shows them after the next sync. This matches the NBE's pre-existing behavior; syncing after upload is a possible follow-up.

Testing instructions

1. Build and run the Jetpack scheme and sign in.
2. Image resize: In App Settings > Media, enable Optimize Images with Max Image Upload Size 2000. Open a post in the NBE, add an Image block, and upload a photo larger than 2000px from the device. Verify the upload succeeds and the stored full-size image is at most 2000px (inspect the attachment in wp-admin or the block's URL).
3. No-op passthrough: Disable Optimize Images and Remove Location From Media, upload the same photo, and verify it retains its original dimensions.
4. Location stripping: Enable Remove Location From Media, upload a GPS-tagged photo, download the original from the site, and verify it has no GPS EXIF data.
5. HEIC: Upload a HEIC image via the Files app and verify it arrives as JPEG.
6. GIF: Upload an animated GIF and verify it still animates on the published post.
7. Video: Set Max Video Upload Size to 480p, upload a video, and verify the transcoded resolution. On a free WordPress.com site, upload a video longer than 5 minutes and verify the "requires a paid plan" notice appears.
8. Verify behavior on both a WordPress.com site and a self-hosted site with an application password.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	33395
	Version	PR #25824
	Bundle ID	org.wordpress.alpha
	Commit	c908b31
	Installation URL	2jcng7cmc82d0

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	33395
	Version	PR #25824
	Bundle ID	com.jetpack.alpha
	Commit	c908b31
	Installation URL	1rrrehhc9o3q0

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.