fix: harden handoff status transitions

src/lib/agentHandoff.ts

@@ -22,8 +22,13 @@ export function isPendingHandoff(item: AgentHandoffItem): boolean {
   return item.status === "queued" || item.status === "shown";
 }
 
-export function mergeLoadedHandoffs(items: AgentHandoffItem[]): AgentHandoffItem[] {
-  return items.filter(isPendingHandoff).sort((a, b) => Date.parse(a.createdAt) - Date.parse(b.createdAt));
+export function mergeLoadedHandoffs(
+  items: AgentHandoffItem[],
+  ignoredIds: ReadonlySet<string> = new Set(),
+): AgentHandoffItem[] {
+  return items
+    .filter((item) => isPendingHandoff(item) && !ignoredIds.has(item.id))
+    .sort((a, b) => Date.parse(a.createdAt) - Date.parse(b.createdAt));
 }
 
 export function updateHandoffStatus(

src/stores/agentRuntimeStore.ts

@@ -17,6 +17,7 @@ export const useAgentRuntimeStore = defineStore("agentRuntime", () => {
   const handoffs = ref<AgentHandoffItem[]>([]);
   const activeHandoffId = ref<string | null>(null);
   const handoffDialogOpen = ref(false);
+  const locallyClosedHandoffIds = new Set<string>();
   let timer: ReturnType<typeof setTimeout> | null = null;
 
   const activeHandoff = computed(() => handoffs.value.find((item) => item.id === activeHandoffId.value) ?? null);
@@ -59,7 +60,7 @@ export const useAgentRuntimeStore = defineStore("agentRuntime", () => {
   }
 
   async function loadHandoffs() {
-    const loaded = mergeLoadedHandoffs(await api.agentRuntimeLoadHandoffs());
+    const loaded = mergeLoadedHandoffs(await api.agentRuntimeLoadHandoffs(), locallyClosedHandoffIds);
     handoffs.value = loaded;
     const state = deriveHandoffDialogState(loaded, activeHandoffId.value);
     activeHandoffId.value = state.active?.id ?? null;
@@ -76,6 +77,7 @@ export const useAgentRuntimeStore = defineStore("agentRuntime", () => {
 
   async function rejectHandoff(id: string) {
     await api.agentRuntimeRejectHandoff(id);
+    locallyClosedHandoffIds.add(id);
     handoffs.value = updateHandoffStatus(handoffs.value, id, "rejected");
     const state = deriveHandoffDialogState(handoffs.value, activeHandoffId.value === id ? null : activeHandoffId.value);
     activeHandoffId.value = state.active?.id ?? null;