test(chat): preserve seeded conversation on reload

The saved-message edit test reloads the page to verify persistence, but its init script was replacing localStorage with the original fixture on every navigation. Seed only an empty store so reloads exercise the data written by the application.

Assisted-by: Codex:gpt-5 [Codex]

core/http/react-ui/e2e/forking-chat.spec.js

@@ -3,6 +3,7 @@ import { test, expect } from './coverage-fixtures.js'
 // Seeds two-message chat into localStorage so we don't need a live model.
 async function seedChat(page, history) {
   await page.addInitScript((h) => {
+    if (localStorage.getItem('localai_chats_data')) return
     const chat = {
       id: 'seed1', name: 'Seeded Chat', model: 'test-model',
       history: h, systemPrompt: '', mcpMode: false, mcpServers: [],