frontend/src/App.css

@@ -969,6 +969,7 @@ body {
 
 .chat-input__field {
   flex: 1;
+  min-width: 0;
   padding: 10px 14px;
   border: 1px solid var(--color-border);
   border-radius: var(--radius-sm);
@@ -996,6 +997,7 @@ body {
   font-size: 0.9rem;
   cursor: pointer;
   transition: opacity var(--transition-fast);
+  flex-shrink: 0;
 }
 
 .chat-input__send:hover:not(:disabled) {