fix: federation self-connection causing sidebar space duplication

Guard autoConnectAll against connecting to window.location.origin,
send perspective-correct replicatedInstances lists so remotes never
store self-references, and deduplicate unaccounted spaces in sidebar.

packages/web/src/components/layout/SpaceSidebar.tsx

@@ -899,6 +899,7 @@ export function SpaceSidebar() {
     for (const space of spaces) {
       if (!accountedSpaceIds.has(space.id)) {
         result.push({ type: 'space', space });
+        accountedSpaceIds.add(space.id);
       }
     }