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

apps/desktop/src/pages/ConversationPage.tsx

@@ -78,6 +78,7 @@ import { markRead as markMessagesReadRemote, useMessageReads } from '../lib/useM
 import { usePeerPresence } from '../lib/usePeerPresence';
 import { usePinnedMessages } from '../lib/usePinnedMessages';
 import { useTypingChannel } from '../lib/useTypingChannel';
+import { clearDraft, getDraftSync, setDraft } from '../lib/composerDraftStore';
 
 // Discriminated union for rows inside the virtualized message list. Keeping
 // pending bubbles and the "load older" tile inside the same Virtuoso
@@ -200,7 +201,10 @@ export function ConversationPage() {
     });
   }, [id, messages, myId]);
 
-  const [text, setText] = useState('');
+  const [text, setText] = useState<string>(() => {
+    if (!id) return '';
+    return getDraftSync(id)?.text ?? '';
+  });
   const [sending, setSending] = useState(false);
   const [sendError, setSendError] = useState<string | null>(null);
   const [stickToBottom, setStickToBottom] = useState(true);
@@ -304,6 +308,21 @@ export function ConversationPage() {
   const fileInputRef = useRef<HTMLInputElement>(null);
   const composerRef = useRef<HTMLTextAreaElement>(null);
 
+  useEffect(() => {
+    if (!id) return;
+    const draft = getDraftSync(id);
+    const savedReplyToId = draft?.replyToId ?? null;
+    if (!savedReplyToId) return;
+    if (replyTo?.id === savedReplyToId) return;
+    const match = messages.find((m) => m.id === savedReplyToId);
+    if (match) setReplyTo(match);
+  }, [id, messages, replyTo?.id]);
+
+  useEffect(() => {
+    if (!id) return;
+    setDraft(id, { text, replyToId: replyTo?.id ?? null });
+  }, [id, text, replyTo?.id]);
+
   useEffect(() => {
     if (firstUnreadComputedRef.current) return;
     if (!id || messages.length === 0) return;
@@ -753,6 +772,7 @@ export function ConversationPage() {
       if (fileInputRef.current) fileInputRef.current.value = '';
       setStickToBottom(true);
       notifyStopTyping();
+      if (id) clearDraft(id);
     } catch (err: unknown) {
       const code = extractErrorCode(err);
       setSendError(