Fix an issue with a missing "Mark as Unread" button in the More menu

[kean]

Fixes #23916.

Changes:

• Revert the change that removed the "Mark as Read/Unread" button from the post "More" menu
• Add an understated "Read" indicator in the list (new feature)

This change applies to P2s. I don't think regular blogs support this.

To test:

• Verify that the post you read have a checkmark in the lsit
• Verify that after you open an unread post and return to the list, it shows the checkmark
• Verify that you can toggle the "read" status using the "more" menu and that it updates state on the web

Regression Notes

1. Potential unintended areas of impact

2. What I did to test those areas of impact (or what existing automated tests I relied on)

3. What automated tests I added (or what prevented me from doing so)

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Testing checklist:

• WordPress.com sites and self-hosted Jetpack sites.
• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• VoiceOver.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• iPhone and iPad.
• Multi-tasking: Split view and Slide over. (iPad)

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

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[crazytonyli]

Out of curiosity, why is a special flag used here? If the idea is to prevent repeated changes to image, maybe a lazy var is more appropriate?

[kean]

It's a bit cumbersome, but the view is created eagerly during the setup:

let headerView = UIStackView(alignment: .center, [buttonAuthor, dot, timeLabel, seenCheckmark])

Ideally, I should create it lazily and add it lazily to the stack view, but I felt it was simpler this way.

[crazytonyli]

I guess you could make a lazy var seenCheckmar: UIImage so that this configuration function can be called repeatedly. Maybe it's personal preference, but I'm not a big fan of boolean flag type of states.