feat: carry archive UI label hard cut updates

packages/app/src/screens/workspace/workspace-agent-visibility.ts

@@ -0,0 +1,68 @@
+import type { Agent } from "@/stores/session-store";
+
+function sortAgentsByCreatedAtDescending(agents: Agent[]): Agent[] {
+  const sorted = [...agents];
+  sorted.sort((left, right) => {
+    const createdAtDelta = right.createdAt.getTime() - left.createdAt.getTime();
+    if (createdAtDelta !== 0) {
+      return createdAtDelta;
+    }
+    return right.lastActivityAt.getTime() - left.lastActivityAt.getTime();
+  });
+  return sorted;
+}
+
+function trimNonEmpty(value: string | null | undefined): string | null {
+  if (!value) {
+    return null;
+  }
+  const trimmed = value.trim();
+  return trimmed.length > 0 ? trimmed : null;
+}
+
+export function deriveWorkspaceAgentVisibility(input: {
+  sessionAgents: Map<string, Agent> | undefined;
+  workspaceId: string;
+}): {
+  visibleAgents: Agent[];
+  lookupById: Map<string, Agent>;
+} {
+  const { sessionAgents, workspaceId } = input;
+  if (!sessionAgents || !workspaceId) {
+    return {
+      visibleAgents: [],
+      lookupById: new Map<string, Agent>(),
+    };
+  }
+
+  const lookupById = new Map<string, Agent>();
+  const visible: Agent[] = [];
+  for (const agent of sessionAgents.values()) {
+    if ((trimNonEmpty(agent.cwd) ?? "") !== workspaceId) {
+      continue;
+    }
+    lookupById.set(agent.id, agent);
+    if (!agent.archivedAt) {
+      visible.push(agent);
+    }
+  }
+
+  return {
+    visibleAgents: sortAgentsByCreatedAtDescending(visible),
+    lookupById,
+  };
+}
+
+export function canOpenAgentTabFromRoute(input: {
+  agentId: string;
+  agentsHydrated: boolean;
+  workspaceAgentLookup: Map<string, Agent>;
+}): boolean {
+  if (!input.agentId.trim()) {
+    return false;
+  }
+  if (!input.agentsHydrated) {
+    return true;
+  }
+  return input.workspaceAgentLookup.has(input.agentId);
+}