fix(teacher): 独立刷新老师目录以缩短配置更新延迟

src/pages/Chat/use-teacher-companion.ts

@@ -141,11 +141,14 @@ export function useTeacherCompanion(options: Options) {
     const base = projectId ? teacherTopicsPath(projectId) : '';
     type LoadedCatalog = { enabled: boolean; selected?: TeacherCatalog['items'][number]; selectedId?: string };
     let configFlight: Promise<LoadedCatalog> | null = null;
+    let catalogRevision: number | undefined;
+    let checkingCatalog = false;
     const loadConfig = (): Promise<LoadedCatalog> => {
       if (configFlight) return configFlight;
       configFlight = (async () => {
         const [config, catalog] = await Promise.all([teacherApi.config(), teacherApi.catalog()]);
         if (!alive || scopeRef.current !== scope) return { enabled: false };
+        catalogRevision = catalog.revision;
         const selection = (current: CompanionState) => {
           const selectedId = current.selectedAgent?.teacher_id ?? current.topic?.definition.config_id
             ?? readLocal<string | undefined>(storageKey + ':selected-agent', undefined);
@@ -215,10 +218,7 @@ export function useTeacherCompanion(options: Options) {
       }
       // Delivered agents own one chat per project. Project observations
       // have their own Main scheduler; this legacy timer must not create topics.
-      if (currentState.selectedAgent || currentState.agents.length) {
-        try { await loadConfig(); } catch { /* Keep last known delivered contacts. */ }
-        return;
-      }
+      if (currentState.selectedAgent || currentState.agents.length) return;
       if (!projectId || current.sourceBusy || current.sourceArchived || !current.sourceId || (current.teacherOpen && current.teacherComposing)) return;
       if (Date.now() - lastAttempt < TEACHER_CHECK_IN_INTERVAL_MS) return;
       if (unreadInvitation(currentState)) return;
@@ -252,13 +252,25 @@ export function useTeacherCompanion(options: Options) {
       }
     };
     const timer = window.setInterval(() => { void check(); }, 15_000);
-    const onVisible = () => { void check(); };
+    // Catalog freshness is independent of chat/check-in state and never dispatches a model.
+    const refreshCatalog = async () => {
+      if (!alive || checkingCatalog || document.visibilityState !== 'visible') return;
+      checkingCatalog = true;
+      try {
+        const current = await teacherApi.catalogRevision();
+        if (alive && scopeRef.current === scope && current.revision !== catalogRevision) await loadConfig();
+      } catch { /* Keep the last usable catalog; the next visible tick retries. */ }
+      finally { checkingCatalog = false; }
+    };
+    const catalogTimer = window.setInterval(() => { void refreshCatalog(); }, 5_000);
+    const onVisible = () => { void refreshCatalog(); void check(); };
     window.addEventListener('focus', onVisible);
     document.addEventListener('visibilitychange', onVisible);
     return () => {
       alive = false;
       if (configLoader.current === loadConfig) configLoader.current = null;
       window.clearInterval(timer);
+      window.clearInterval(catalogTimer);
       window.removeEventListener('focus', onVisible);
       document.removeEventListener('visibilitychange', onVisible);
     };