Reader: defer likers row until post body renders (CMM-2049)

[nbradbury]

Description

Fixes CMM-2049.

When loading a Reader post detail, two progress spinners could briefly appear stacked in the upper portion of the screen — the inline likers-faces spinner in the post header and the WebView content spinner above the body.

This PR defers the likers row until the WebView has laid out (hasWebViewContent = true) and ditches the likers progress spinner.

Testing instructions

1. Open the Reader on the Jetpack app
2. Tap any post in the feed that has likers

• Verify only a single progress spinner is visible during load (centered above the post body)
• Verify the likers row does NOT appear before the post body renders
• Verify the post body renders first, then the likers avatars appear right below the subscribe row

3. Repeat with a post that has zero likes

• Verify no likers row appears at all

4. Repeat with airplane-mode / throttled connectivity so the load is observably slow

• Verify there is never a moment where two spinners are visible simultaneously

Note: The merged PR #22807 makes testing this one easier since it gives a quick way to reset the reader DB.

Before

progress-before.mp4

After

progress-after.mp4

[dangermattic]

	1 Warning
⚠️	PR is not assigned to a milestone.

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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	pr22808-667478e
	Build Number	1488
	Application ID	com.jetpack.android.prealpha
	Commit	667478e
	Installation URL	327bv2dg6o9g8

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 WordPress Android by scanning the QR code below to install the corresponding build.

	App Name	WordPress Android
	Build Type	Debug
	Version	pr22808-667478e
	Build Number	1488
	Application ID	org.wordpress.android.prealpha
	Commit	667478e
	Installation URL	4gafqjg7jpuuo

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

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 37.15%. Comparing base (b8792b3) to head (667478e).
⚠️ Report is 1 commits behind head on trunk.

Files with missing lines	Patch %	Lines
.../ui/reader/viewmodels/ReaderPostDetailViewModel.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk   #22808      +/-   ##
==========================================
- Coverage   37.15%   37.15%   -0.01%     
==========================================
  Files        2314     2314              
  Lines      124297   124294       -3     
  Branches    16882    16882              
==========================================
- Hits        46188    46185       -3     
  Misses      74366    74366              
  Partials     3743     3743              

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[adalpari]

Nice change!