Replica spaces should reflect channel and space-metadata changes made on the home server, the same way local spaces already live-update (see closed issue #59 for the local equivalent).

What to do

• Apply channel create/update/delete and space metadata fanout to replica spaces so the channel list and space header stay in sync.
• Ensure replica spaces use qualified channel IDs consistently for navigation and message fetches.

Acceptance

• A channel added/removed/renamed on the home server is reflected in the replica without reconnecting.

Server reference

• Replica application of fanned-out content: src/federation/apply.rs; space replica migration migrations/028_federation_replica.sql.

Client touch points

• lib/features/spaces/controllers/space.dart.

Server reference — accordserver branch claude/federated-servers-xlydlj.