Media posted after the tab was opened for the first time is not shown in the tab

[nickvergessen]

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Steps to reproduce

1. Open media tab
2. Post a new image in the chat
3. Check media tab again

Expected behaviour

New item shows

Actual behaviour

New item doesn't show

We should automatically add the message to the sharedItemStore as well when receiving it via the chat api

[nickvergessen]

Fixed with #7149