feat(kanban): card detail modal and rich agent-run console

- RunEventList: grouped activity timeline. Assistant text becomes chat
  bubbles (auto-collapsing long messages); tool_start/tool_end pair into
  entries with spinners and expandable input/result blocks; bevy output
  rolls into a live console; relative timestamps on a left rail
- AgentRunBar: redesigned as a mission console. Live stats header (elapsed
  time, tool count, events), animated status banner with sweep/glow while
  running, clearer action bar. All controls preserved (run/steer/stop,
  diff/merge/bevy) so the human-only merge/complete safety model holds
- tailwind.css: vn-flow, vn-sweep, vn-dots, vn-spin keyframes
- CardModal: full card overlay (orchestrator, references, tags, comments)
- DiffModal: branch-diff review (commits, stat, capped patch)
- useOrchestrator: background polling + bevy status sync + ref-counted SSE
- KanbanCard: pulsing agent/bevy running badge on collapsed cards

apps/docs/src/styles/tailwind.css

@@ -29,6 +29,57 @@
   --spacing-content: 1100px;
 }
 
+/* Live indicator for active agent/Bevy runs (used by inline-styled badges). */
+@keyframes vn-pulse {
+  0%, 100% {
+    opacity: 1;
+    transform: scale(1);
+  }
+  50% {
+    opacity: 0.35;
+    transform: scale(0.7);
+  }
+}
+
+/* Moving gradient sweep across an active run's status banner. */
+@keyframes vn-sweep {
+  0% {
+    transform: translateX(-120%);
+  }
+  100% {
+    transform: translateX(220%);
+  }
+}
+
+/* Bouncing dots used by "working…" / typing indicators. */
+@keyframes vn-dots {
+  0%, 80%, 100% {
+    opacity: 0.25;
+    transform: translateY(0);
+  }
+  40% {
+    opacity: 1;
+    transform: translateY(-2px);
+  }
+}
+
+/* Spinner for an in-flight tool call. */
+@keyframes vn-spin {
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+/* Flowing gradient along an active run's top edge (background-position). */
+@keyframes vn-flow {
+  0% {
+    background-position: 0% 0;
+  }
+  100% {
+    background-position: 200% 0;
+  }
+}
+
 @layer base {
   :root {
     --bg: var(--color-bg);