5.7 Add complete UI feedback for trusted-session invitations

[marwannettour]

Parent epic: #311

Summary

Display invitation and join status on both initiator and recipient sides.

Requirements

• On the initiator side, show invited clients and states such as pending, delivered, accepted, rejected, joined, and failed.
• Allow resending invitations when appropriate, such as after expiration.
• On the recipient side, show automatic join status, origin client, requested mode, and exit options.

Acceptance criteria

• Users can understand the status of each invited client.
• Recipient-side automatic joins are visible.
• Failure states are actionable and clear.