feat(sidebar): show host name on every row in multi-host setups (#1775)

The host name previously appeared only in project grouping mode, and only
for projects shared across hosts. It now shows on every workspace row in
both project and status grouping modes whenever the sidebar spans more than
one host, so you can always tell which machine a workspace lives on. Status
rows read "Project · Host". Single-host setups are unchanged.

packages/app/src/hooks/use-sidebar-workspaces-list.ts

@@ -31,6 +31,7 @@ export {
   computeSidebarOrderUpdates,
   createSidebarWorkspaceEntry,
   deriveSidebarLoadingState,
+  shouldShowSidebarHostLabels,
   type SidebarLoadingState,
   type SidebarOrderUpdates,
   type SidebarStatusWorkspacePlacement,