feat: Implement LatestContentProvider for WebView recovery

[dcalhoun]

Description

Ref CMM-1123.

This is a rebased version of #22493, targeting the jkmassel/gutenbergkit-settings-refactor branch (#22764) so it can be reviewed/tested on top of the GutenbergKit v0.15.0 upgrade.

Implements GutenbergKit's LatestContentProvider interface for pull-based content recovery.

When the WebView reinitializes (due to OS memory pressure or page refresh), the editor now requests the latest content from the app rather than using stale content from the initial WebView load. This ensures users don't lose their work during WebView recovery.

Changes:

• Added getPersistedTitle() and getPersistedContent() methods to EditorFragmentListener interface
• Set up LatestContentProvider on GutenbergView in GutenbergKitEditorFragment
• Implemented the interface methods in GutenbergKitActivity returning content from EditPostRepository
• Properly set the post status to avoid unexpectedly emptying post titles

Rebase notes:

• Dropped 3 obsolete GutenbergKit version-bump commits (target branch already updates to v0.15.0)
• Dropped the warmup-helper fix commit (warmup is a no-op stub on the new branch pending re-implementation against the v0.15.0 API)
• Adapted EditorConfigurationBuilder to the new builder API: setStatus(...) → setPostStatus(...) and removed the now-redundant setPostType(...) call (postType is a constructor argument)

Related PRs:

• Original PR: feat: Implement LatestContentProvider for WebView recovery #22493
• Base PR: Upgrade GutenbergKit from v0.11.1 to v0.15.0 #22764
• GutenbergKit: feat: Recover content on WebView refresh via pull model GutenbergKit#283
• WordPress-iOS: feat: Implement editorRequestsLatestContent for WebView recovery WordPress-iOS#25144

Testing instructions

WebView refresh recovery:

1. Open a post with existing content in the GutenbergKit editor
2. Make edits to the content (wait 2+ seconds for autosave to persist)
3. Trigger a WebView refresh: press Cmd+R while the WebView is inspected via the Chrome Inspector at chrome://inspect

• Verify the editor recovers with the edited content, not the original

[dangermattic]

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[wpmobilebot]

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

	App Name	Jetpack Android
	Build Type	Debug
	Version	pr22774-8e919cc
	Build Number	1488
	Application ID	com.jetpack.android.prealpha
	Commit	8e919cc
	Installation URL	7cj6lqg2kccr8

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[wpmobilebot]

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

	App Name	WordPress Android
	Build Type	Debug
	Version	pr22774-8e919cc
	Build Number	1488
	Application ID	org.wordpress.android.prealpha
	Commit	8e919cc
	Installation URL	4bou7ib4plvcg

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.40%. Comparing base (6cfa2a2) to head (8e919cc).

Files with missing lines	Patch %	Lines
...ss/android/ui/posts/GutenbergKitSettingsBuilder.kt	60.00%	2 Missing ⚠️
...ess/android/ui/posts/EditorConfigurationBuilder.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                           Coverage Diff                            @@
##           jkmassel/gutenbergkit-settings-refactor   #22774   +/-   ##
========================================================================
  Coverage                                    37.40%   37.40%           
========================================================================
  Files                                         2320     2320           
  Lines                                       123654   123658    +4     
  Branches                                     16793    16795    +2     
========================================================================
+ Hits                                         46256    46258    +2     
- Misses                                       73687    73689    +2     
  Partials                                      3711     3711           

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