feat: 增加失败历史详情渲染功能，展示失败反馈信息

ccw/src/templates/dashboard-css/32-issue-manager.css

@@ -331,6 +331,79 @@
   word-break: break-word;
 }
 
+/* Failure History Detail */
+.failure-history-list {
+  display: flex;
+  flex-direction: column;
+  gap: 0.75rem;
+}
+
+.failure-history-item {
+  padding: 0.75rem;
+  background: hsl(var(--destructive) / 0.06);
+  border: 1px solid hsl(var(--destructive) / 0.15);
+  border-radius: 0.5rem;
+}
+
+.failure-history-header {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  margin-bottom: 0.5rem;
+  color: hsl(var(--destructive));
+}
+
+.failure-history-count {
+  font-size: 0.875rem;
+  font-weight: 500;
+}
+
+.failure-history-timestamp {
+  margin-left: auto;
+}
+
+.failure-history-content {
+  display: flex;
+  flex-direction: column;
+  gap: 0.375rem;
+  padding-left: 0.5rem;
+}
+
+.failure-history-task,
+.failure-history-error {
+  display: flex;
+  align-items: center;
+  gap: 0.375rem;
+}
+
+.failure-history-message pre {
+  margin: 0;
+  white-space: pre-wrap;
+}
+
+.failure-history-stacktrace {
+  margin-top: 0.375rem;
+}
+
+.failure-history-stacktrace summary {
+  margin-bottom: 0.25rem;
+}
+
+.failure-history-stacktrace pre {
+  margin: 0;
+  background: hsl(var(--background));
+  padding: 0.5rem;
+  border-radius: 0.25rem;
+  border: 1px solid hsl(var(--border));
+}
+
+.detail-label-sm {
+  font-size: 0.75rem;
+  font-weight: 500;
+  color: hsl(var(--muted-foreground));
+  min-width: 60px;
+}
+
 /* Priority Badges */
 .issue-priority {
   display: inline-flex;