fix(ui): render text-block tool results

ui/src/styles/chat/tool-cards.css

@@ -361,7 +361,15 @@
 
 .chat-tool-card__block-content {
   color: var(--text);
-  overflow-x: auto;
+  overflow: auto;
+  max-height: min(520px, 60vh);
+}
+
+.chat-tool-card__inline {
+  margin-top: 10px;
+  white-space: pre-wrap;
+  overflow-wrap: anywhere;
+  word-break: break-word;
 }
 
 .chat-tool-card__block-preview {

ui/src/ui/chat/tool-cards.node.test.ts

@@ -136,6 +136,35 @@ describe("tool-card extraction", () => {
     });
   });
 
+  it("extracts tool result output from text block content arrays", () => {
+    const cards = extractToolCards(
+      {
+        role: "assistant",
+        content: [
+          {
+            type: "toolcall",
+            id: "call-read",
+            name: "read",
+            input: { path: "README.md" },
+          },
+          {
+            type: "tool_result",
+            id: "call-read",
+            name: "read",
+            content: [
+              { type: "text", text: "# Heading" },
+              { type: "text", text: "file body" },
+            ],
+          },
+        ],
+      },
+      "msg:read",
+    );
+
+    expect(cards).toHaveLength(1);
+    expect(cards[0]?.outputText).toBe("# Heading\nfile body");
+  });
+
   it("builds sidebar content with input and empty output status", () => {
     const [card] = extractToolCards(
       {

ui/src/ui/chat/tool-cards.ts

@@ -48,6 +48,18 @@ function extractToolText(item: Record<string, unknown>): string | undefined {
   if (typeof item.content === "string") {
     return item.content;
   }
+  if (Array.isArray(item.content)) {
+    const parts = item.content.flatMap((entry) => {
+      if (!entry || typeof entry !== "object") {
+        return [];
+      }
+      const text = (entry as { text?: unknown }).text;
+      return typeof text === "string" ? [text] : [];
+    });
+    if (parts.length > 0) {
+      return parts.join("\n");
+    }
+  }
   return undefined;
 }