Replace outer div.connections-page wrapper and explicit PageHeader with
PageShell component. Update connections-mobile-auth snapshot to match
the stable full-suite render state (filter bar absent when test admin
has no cooperative topics configured).
- useConnections composable wrapping all /api/connections endpoints
- Connections page with suggestions, filters, and connection management
- Pending connection count badge in sidebar navigation
- peer-support.vue now redirects to /connections
