Fix flaky tests

frontend/src/test/appSearchJump.test.tsx

@@ -1,5 +1,5 @@
 import React from 'react';
-import { fireEvent, render, screen, waitFor } from '@testing-library/react';
+import { act, fireEvent, render, screen, waitFor } from '@testing-library/react';
 import { beforeEach, describe, expect, it, vi } from 'vitest';
 
 const PUBLIC_CHANNEL_KEY = '8B3387E9C5CDEA6AC9E5EDBAA115CD72';
@@ -236,7 +236,9 @@ describe('App search jump target handling', () => {
   });
 
   it('clears jump target when user selects a non-search conversation', async () => {
-    render(<App />);
+    await act(async () => {
+      render(<App />);
+    });
 
     await waitFor(() => {
       expect(screen.getAllByText('Open Search').length).toBeGreaterThan(0);
@@ -267,7 +269,9 @@ describe('App search jump target handling', () => {
   });
 
   it('opens search with a prefilled query from the contact pane', async () => {
-    render(<App />);
+    await act(async () => {
+      render(<App />);
+    });
 
     await waitFor(() => {
       expect(screen.getByText('Search Contact By Key')).toBeInTheDocument();

frontend/src/test/appStartupHash.test.tsx

@@ -181,7 +181,10 @@ describe('App startup hash resolution', () => {
   });
 
   afterEach(() => {
-    window.location.hash = '';
+    // window.location.hash is intentionally NOT reset here: setting it fires a hashchange
+    // event while the component is still mounted (RTL cleanup runs after this describe-level
+    // hook), which queues a stale state update that races the next test's setup. beforeEach
+    // sets a known hash before each render, so this reset is redundant.
     localStorage.clear();
   });
 
@@ -443,6 +446,12 @@ describe('App startup hash resolution', () => {
         }
       });
 
+      // Flush any pending React work (contacts render + its effects) so that
+      // contactsRef.current is populated before the popstate handler reads it.
+      // waitFor may resolve after the channels render commits but before the
+      // contacts render commits, leaving contactsRef.current=[].
+      await act(async () => {});
+
       act(() => {
         window.location.hash = `#contact/${aliceContact.public_key}/Alice`;
         window.dispatchEvent(new PopStateEvent('popstate', { state: null }));