🌐 Federated chatting 💬 - Frontend

[nickvergessen]

• Overview ticket at 🌐 Federated chatting 💬 - Overview #11231

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• Getting messages (context, new, old)
• Posting messages (plain)
• Forwarding messages (plain, objects (deck cards-like)) to federated rooms #11898
• Reacting to messages
• Deleting messages
• Editing messages