Add notification centre and realtime toasts

apps/dashboard/src/styles.css

@@ -42,6 +42,7 @@ nav { display: grid; gap: .35rem; }
 .navigation-backdrop { position: fixed; inset: 0; z-index: 20; width: 100%; border: 0; background: rgba(0, 0, 0, .6); }
 .workspace { min-height: 100vh; }
 .mobile-header { position: sticky; top: 0; z-index: 15; display: flex; align-items: center; justify-content: space-between; height: 4rem; padding: 0 1rem; background: rgba(9, 17, 14, .92); border-bottom: 1px solid var(--border); backdrop-filter: blur(12px); font-weight: 700; }
+.mobile-header-actions { display: flex; gap: .55rem; }
 .icon-button { width: 2.5rem; height: 2.5rem; border: 1px solid var(--border); border-radius: .6rem; color: white; background: var(--surface); font-size: 1.25rem; }
 main { min-height: calc(100vh - 4rem); }
 .page { width: min(78rem, 100%); margin: 0 auto; padding: 1.5rem 1rem 4rem; }