fix(sync): show complete workspace and agent history (#2263)

Cached focused state was leaking into the sidebar before authoritative workspace hydration, while catch-up limits counted raw events instead of projected entries. Keep the focused cache fast, gate directory presentation on hydration, and preserve canonical cursors while paging projected history.

packages/app/src/stores/session-store-hooks/selectors.ts

@@ -131,6 +131,13 @@ export function selectHasHydratedWorkspaces(
   return serverId ? (state.sessions[serverId]?.hasHydratedWorkspaces ?? false) : false;
 }
 
+export function selectHydratedWorkspaceServerIds(
+  state: SessionsSnapshot,
+  serverIds: readonly string[],
+): string[] {
+  return serverIds.filter((serverId) => state.sessions[serverId]?.hasHydratedWorkspaces === true);
+}
+
 export function selectWorkspaceStructureProjects(
   state: SessionsSnapshot,
   serverIds: readonly string[],