feat(composer): persist text + reply target per chat across restarts

apps/desktop/src/App.tsx

@@ -1,4 +1,4 @@
-import { lazy, Suspense } from 'react';
+import { lazy, Suspense, useEffect } from 'react';
 import { HashRouter, Navigate, Outlet, Route, Routes, useParams } from 'react-router-dom';
 
 import { AppShell } from './components/AppShell';
@@ -13,6 +13,7 @@ import { CallProvider } from './context/CallContext';
 import { ConversationsProvider } from './context/ConversationsContext';
 import { FriendshipsProvider } from './context/FriendshipsContext';
 import { ThemeProvider } from './context/ThemeContext';
+import { hydrateDrafts } from './lib/composerDraftStore';
 import { AuthPage } from './pages/AuthPage';
 import { ChatsEmptyState, ChatsPage } from './pages/ChatsPage';
 import { ConversationPage } from './pages/ConversationPage';
@@ -73,6 +74,10 @@ function ConversationRoute() {
 }
 
 export function App() {
+  useEffect(() => {
+    void hydrateDrafts();
+  }, []);
+
   return (
     <ErrorBoundary scope="root">
       <ThemeProvider>