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/coordinator.rs

@@ -54,6 +54,16 @@ pub struct TransientState {
 pub enum TransientKind {
     /// `lifecycle::spawn` is running (nixos-container create + update + start).
     Spawning,
+    /// `lifecycle::start` is running.
+    Starting,
+    /// `lifecycle::kill` is running.
+    Stopping,
+    /// `lifecycle::restart` is running.
+    Restarting,
+    /// `lifecycle::rebuild` is running (nixos-container update).
+    Rebuilding,
+    /// `actions::destroy` is running.
+    Destroying,
 }
 
 impl Coordinator {