fix thread sorting issue (#5976)

Author: cmppoon

web-app/src/hooks/useThreads.ts

@@ -103,6 +103,7 @@ export const useThreads = create<ThreadState>()((set, get) => ({
           [threadId]: {
             ...state.threads[threadId],
             isFavorite: !state.threads[threadId].isFavorite,
+            updated: Date.now() / 1000,
           },
         },
       }
@@ -221,6 +222,7 @@ export const useThreads = create<ThreadState>()((set, get) => ({
           [state.currentThreadId as string]: {
             ...state.threads[state.currentThreadId as string],
             assistants: [assistant],
+            updated: Date.now() / 1000,
           },
         },
       }
@@ -249,6 +251,7 @@ export const useThreads = create<ThreadState>()((set, get) => ({
       const updatedThread = {
         ...thread,
         title: newTitle,
+        updated: Date.now() / 1000,
       }
       updateThread(updatedThread) // External call, order is fine
       const newThreads = { ...state.threads, [threadId]: updatedThread }