Make markdown task list interactive

[sowjanyakch]

fix #6374

🚧 TODO

• ...

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not needed
• 🔖 Capability is checked or not needed
• 🔙 Backport requests are created or not needed: /backport to stable-xx.x
• 📅 Milestone is set
• 🌸 PR title is meaningful (if it should be in the changelog: is it meaningful to users?)

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI

[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/28462747468/artifacts/7988536467
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/28534366597/artifacts/8017439184
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

APK file: https://github.com/nextcloud/talk-android/actions/runs/29758915178/artifacts/8468108417
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

Codacy

Lint

Type	master	PR
Warnings	85	95
Errors	5	5

SpotBugs

Category	Base	New
Bad practice	6	6
Correctness	11	11
Dodgy code	52	52
Internationalization	3	3
Malicious code vulnerability	3	3
Performance	5	5
Security	1	1
Total	81	81

Lint increased!

[mahibi]

rapterjet2004 self-requested a review last week

@rapterjet2004 was it supposed to be me? So is it ready for a review?

[rapterjet2004]

Honestly, I just wanted to get it merged, but after reviewing it I decided to hold off on the approval, Currently the state seems to work, but it's slow and doesn't seem to work for older messages. I wanted to take a lot at the logic behind it.

Currently my idea is to cache the change first, have it update the UI state, and then after a time period sent the newly updated message to the server to synchronize state once all the checkboxes have been edited.

Screen_recording_20260727_105906.webm