feat(FN-5227): add bulk controls for project agents

- Add project-scoped Pause All Agents and Resume All Agents actions to the AgentsView controls menu
- Load bulk-action eligibility on menu open and skip ephemeral or ineligible agents
- Surface bulk action confirmations, success/error toasts, and refresh agent state after updates
- Add dashboard tests and agent docs coverage for the new bulk controls

Fusion-Task-Id: FN-5227

packages/dashboard/app/components/AgentsView.css

@@ -146,6 +146,53 @@
   justify-content: center;
 }
 
+.agent-controls-bulk-actions {
+  background: var(--surface);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-md);
+  box-shadow: var(--shadow-lg);
+  padding: var(--space-xs);
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-xs);
+}
+
+.agent-controls-bulk-actions__label {
+  display: inline-flex;
+  align-items: center;
+  gap: var(--space-sm);
+}
+
+.agent-detail-bulk-menu-item {
+  width: 100%;
+  border: 0;
+  border-radius: var(--radius-sm);
+  background: transparent;
+  color: var(--text);
+  text-align: left;
+  padding: var(--space-sm);
+  display: flex;
+  flex-direction: column;
+  gap: calc(var(--space-xs) * 0.5);
+  cursor: pointer;
+}
+
+.agent-detail-bulk-menu-item:hover:not(:disabled),
+.agent-detail-bulk-menu-item:focus-visible {
+  outline: none;
+  background: var(--card-hover);
+}
+
+.agent-detail-bulk-menu-item:disabled {
+  color: var(--text-muted);
+  cursor: not-allowed;
+}
+
+.agent-detail-bulk-menu-item-hint {
+  font-size: calc(var(--space-sm) + var(--space-xs) * 0.5);
+  color: var(--text-muted);
+}
+
 .agents-org-full-view {
   display: flex;
   flex: 1;
@@ -1409,6 +1456,10 @@
     min-height: calc(var(--space-lg) * 2 + var(--space-xs));
   }
 
+  .agent-controls-bulk-actions {
+    width: 100%;
+  }
+
   .agents-org-full-view {
     display: flex;
     flex-direction: column;