Add mark as read / unread in room details

[bmarty]

Content

Add "Mark as read" and "Mark as unread" in the room detail screen so that users can see this action without having to long click on a room in the room list.

When user selects "Mark as unread" from this screen, the application navigates back to the room list.

Motivation and context

Mitigate accessibility issue per this comment: #6398 (comment)

Closes #6398

Screenshots / GIFs

"Mark as unread" demo:

Screen_recording_20260520_093228.mp4

Tests

Mark as unread

• Open a room
• Open the room details
• Observe the new "Mark as unread" action
• Click on it
• The application navigate back to the room list and the room is marked as unread

Mark as read

• Open a room
• Open the room details
• Observe the new "Mark as unread" action
• From another account, send a message
• The new "Mark as unread" action become "Mark as read"
• Click on "Mark as read"
• The room is marked as read

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• This PR was made with the help of AI:
  • Yes. In this case, please request a review by Copilot.
  • No.
• Changes have been tested on an Android device or Android emulator with API 24
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly defines what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• You've made a self review of your PR

[github-actions]

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[bmarty]

Hello @mxandreas , I have implemented a first version of #6398 (this comment: #6398 (comment)), but the problem is that if the user selects "Mark as unread" then navigates back to the room, the room will be marked as read. To mitigate this, I propose to automatically navigate back to the room list when the user selects "Mark as unread". Here is a demo, but you can also test it using the QR code above:

Screen_recording_20260520_093228.mp4

This behavior is quite similar to mail clients: when you open a mail then mark it as unread, the application navigate back to the list of mails.

Please let me know if it's OK for you, then I can finalize the PR (add tests, etc.)

[mxandreas]

To mitigate this, I propose to automatically navigate back to the room list when the user selects "Mark as unread". Here is a demo, but you can also test it using the QR code above:

Thanks. Yes, this looks good and indeed, this what the mail apps do as well. cc @americanrefugee

[americanrefugee]

LGTM as well. And we're sure we're happy with the position of this new menu item in the list?

[jmartinesp]

Thanks, LGTM once the new screenshots are recorded and the lint issues fixed.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 86.27451% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.27%. Comparing base (5af5790) to head (260ea4a).
⚠️ Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../features/roomdetails/impl/RoomDetailsPresenter.kt	81.48%	0 Missing and 5 partials ⚠️
...droid/features/roomdetails/impl/RoomDetailsView.kt	88.88%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #6818   +/-   ##
========================================
  Coverage    81.27%   81.27%           
========================================
  Files         2648     2648           
  Lines        74169    74218   +49     
  Branches      9619     9628    +9     
========================================
+ Hits         60281    60324   +43     
- Misses       10341    10342    +1     
- Partials      3547     3552    +5     

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