4.6 Add UI for received trusted-session invitations

[marwannettour]

Parent epic: #310

Summary

Display a manual approval prompt when a valid invitation requires user confirmation.

Requirements

• Show the initiating trusted client name and client ID.
• Show requested mode and optional profile.
• Provide accept, reject, and details actions.
• Consider a future-compatible option to always accept invitations from this client.

Acceptance criteria

• Valid invitations can be accepted or rejected by the user.
• The prompt does not expose sensitive session credentials.
• User decisions are propagated to the invitation flow.