Fix Sentry WORDPRESS-ANDROID-3F1P: emit isPage in prepublishing event

[nbradbury]

Fixes WORDPRESS-ANDROID-3F1P

Summary

Fix for Sentry WORDPRESS-ANDROID-3F1P — 40 users / 43 events. The openPrepublishingBottomSheet observer in PostsListActivity was reaching back into a shared EditPostRepository to read isPage, which dereferences post!!. After activity recreation the event can be redelivered before the repo's loadPostByLocalPostId(...) has run on the recreated instance, so editPostRepository.isPage throws an NPE.

Fix: carry isPage through the event payload itself. The ViewModel already has the PostModel in scope at emit time, so it just emits Event(post.isPage) and the activity uses the unwrapped value — no dependency on shared repository state. This matches the codebase's idiomatic pattern for ViewModel→Activity events (e.g. PostListAction sealed class).

Test plan

• Enable "Don't keep activities" in Developer Options, open the post list, tap the publish quick action on a post, confirm the prepublishing bottom sheet appears with no crash.

[dangermattic]

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	App Name	WordPress Android
	Build Type	Debug
	Version	pr22839-d658c68
	Build Number	1488
	Application ID	org.wordpress.android.prealpha
	Commit	d658c68
	Installation URL	7kig55rgrdrl0

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📲 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	pr22839-d658c68
	Build Number	1488
	Application ID	com.jetpack.android.prealpha
	Commit	d658c68
	Installation URL	4n2c95t9k6af0

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 37.20%. Comparing base (6bef09a) to head (d658c68).

Files with missing lines	Patch %	Lines
...ordpress/android/ui/posts/PostListMainViewModel.kt	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #22839   +/-   ##
=======================================
  Coverage   37.20%   37.20%           
=======================================
  Files        2317     2317           
  Lines      124522   124522           
  Branches    16909    16909           
=======================================
  Hits        46333    46333           
  Misses      74441    74441           
  Partials     3748     3748           

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