dashboard: spinners on in-flight lifecycle actions + cleaner row layout

backend:
- TransientKind grows Starting / Stopping / Restarting / Rebuilding /
  Destroying alongside the existing Spawning. each dashboard handler
  (start/restart/kill/rebuild/destroy) wraps the lifecycle call with
  set_transient + clear_transient so the dashboard knows what's in
  flight. transient kind is surfaced inline on ContainerView.pending
  (existing-container actions) — only Spawning (pre-creation) lands
  in the separate transients list.

frontend:
- container row is now two lines: identity + meta on top, action
  buttons below. less cluttered, leaves room for the pending state
  pill. pending rows dim their actions and surface a pulsing
  '◐ spawning… / starting… / stopping… / restarting… / rebuilding…
  / destroying…' indicator next to the name.
- 'needs login' / 'needs update' chips moved into a unified .badge
  styling for consistency.
- auto-refresh kicks in not only on transient spawn but on any
  container with a pending action.

hive-c0re/src/actions.rs

@@ -140,7 +140,12 @@ pub async fn destroy(coord: &Coordinator, name: &str, purge: bool) -> Result<()>
         bail!("refusing to destroy the manager ({name})");
     }
     tracing::info!(%name, purge, "destroy");
-    lifecycle::destroy(name).await?;
+    coord.set_transient(name, TransientKind::Destroying);
+    let result = lifecycle::destroy(name).await;
+    if result.is_err() {
+        coord.clear_transient(name);
+    }
+    result?;
     coord.unregister_agent(name);
     let runtime = Coordinator::agent_dir(name);
     if runtime.exists() {
@@ -166,6 +171,7 @@ pub async fn destroy(coord: &Coordinator, name: &str, purge: bool) -> Result<()>
             "agent destroyed"
         },
     );
+    coord.clear_transient(name);
     coord.notify_manager(&HelperEvent::Destroyed {
         agent: name.to_owned(),
     });