Show full error messages.

chat-full.html

@@ -115,6 +115,17 @@
       border-style: dashed;
       color: var(--muted);
     }
+      .error-details {
+        font-size: .88em;
+        font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
+        background: color-mix(in oklab, var(--bg) 96%, var(--fg) 4%);
+        color: var(--muted);
+        margin: 6px 0 0 0;
+        padding: 7px 10px;
+        border-radius: 7px;
+        white-space: pre-wrap;
+        overflow-x: auto;
+      }
 
     form#composer {
       position: sticky;

chat-full.js

@@ -28,7 +28,7 @@
     div.className = `msg ${role}`;
     if (role === 'sys' && details) {
       // Показати повідомлення з розгортанням stack trace
-      div.innerHTML = `<span>${text}</span><details style="margin-top:6px;"><summary style="cursor:pointer;user-select:none;">Деталі (stack trace)</summary><pre style="white-space:pre-wrap;font-size:.92em;">${escapeHtml(details)}</pre></details>`;
+    div.innerHTML = `<span>${text}</span><pre class="error-details">${escapeHtml(details)}</pre>`;
     } else {
       div.textContent = text;
     }