error with parial loss of message fixed

math-tutor/frontend/src/components/Chat/ChatWindow.tsx

@@ -8,7 +8,7 @@ type ChatWindowProps = {
   messages: ChatMessage[];
   draft: string;
   onDraftChange: (value: string) => void;
-  onSend: () => void;
+  onSend: (value: string) => void;
   onTip?: () => void;
   onRevealSolution?: () => void;
   isSending?: boolean;

math-tutor/frontend/src/pages/ChatPage.tsx

@@ -835,9 +835,9 @@ export default function ChatPage() {
     setRetrievalLoading(false);
   };
 
-  const handleSend = async () => {
+  const handleSend = async (value: string) => {
     await sendMessage({
-      text: draft,
+      text: value,
       clearDraft: true,
     });
   };

math-tutor/frontend/src/styles/theme.css

@@ -586,6 +586,7 @@ body {
 }
 
 .composer-rich-input {
+  position: relative;
   min-height: 92px;
   line-height: 1.6;
   white-space: pre-wrap;
@@ -594,9 +595,20 @@ body {
   cursor: text;
 }
 
+.composer-rich-input[data-empty="true"]::before,
 .composer-rich-input:empty::before {
   content: attr(data-placeholder);
   color: #8b857b;
+  pointer-events: none;
+}
+
+.composer-text-part {
+  display: inline;
+  outline: none;
+}
+
+.composer-text-part:empty::before {
+  content: "\200b";
 }
 
 .composer-rich-input:focus {