fix(chat): stop orphaned tool results rendering as raw text during pagination

Sessions load in pages from the bottom up, so a loaded page often contains
a tool_result whose tool_use sits in an older, not-yet-loaded page. That
result wasn't recognized as attached, so it was pushed as a standalone
assistant message and its raw output rendered as unstyled Markdown. It only
"fixed itself" once the user scrolled up far enough to load the page with
the matching tool_use.

Skip results that have a toolId but no matching tool_use in the loaded set —
they attach and render correctly (inside their command row/group) once the
older page loads. Results with no toolId still render as before.

src/components/chat/hooks/useChatMessages.ts

@@ -207,6 +207,15 @@ export function normalizedToChatMessages(messages: NormalizedMessage[]): ChatMes
           break;
         }
 
+        // A result with a toolId but no matching tool_use in the loaded set is
+        // almost always a tool_use/tool_result pair split across a pagination
+        // boundary (older page not loaded yet). Rendering its raw content here
+        // produces an unstyled dump that "fixes itself" once the older page
+        // loads; skip it and let it attach to its tool_use when that arrives.
+        if (msg.toolId) {
+          break;
+        }
+
         const content = formatToolResultContent(msg.content || '');
         if (!content.trim()) {
           break;