feat(KB-038): add steps toggle to TaskCard

- Add steps toggle state and expand/collapse UI to TaskCard
- Add expand/collapse all steps button for better task navigation
- Add comprehensive tests for steps toggle functionality
- Update styles.css with toggle button and step list styling
- Include changeset for patch release

packages/dashboard/app/styles.css

@@ -610,6 +610,90 @@ body {
   flex-shrink: 0;
 }
 
+/* Steps toggle and list */
+.card-steps-toggle {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+  margin-top: 6px;
+  padding: 0;
+  background: none;
+  border: none;
+  cursor: pointer;
+  font-size: 11px;
+  color: var(--text-muted);
+  transition: color 0.15s ease;
+}
+
+.card-steps-toggle:hover {
+  color: var(--text);
+}
+
+.card-steps-toggle:focus {
+  outline: 1px solid var(--todo);
+  outline-offset: 1px;
+  border-radius: 2px;
+}
+
+.card-steps-toggle-icon {
+  transition: transform 0.2s ease;
+}
+
+.card-steps-toggle-icon.expanded {
+  transform: rotate(180deg);
+}
+
+.card-steps-list {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  margin-top: 8px;
+  max-height: 200px;
+  overflow-y: auto;
+}
+
+.card-step-item {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  font-size: 12px;
+}
+
+.card-step-dot {
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  flex-shrink: 0;
+}
+
+.card-step-dot--pending {
+  background: var(--border, #30363d);
+}
+
+.card-step-dot--in-progress {
+  background: var(--todo, #58a6ff);
+}
+
+.card-step-dot--done {
+  background: var(--color-success, #3fb950);
+}
+
+.card-step-dot--skipped {
+  background: var(--text-dim, #484f58);
+}
+
+.card-step-name {
+  color: var(--text-muted);
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.card-step-name.completed {
+  text-decoration: line-through;
+  opacity: 0.6;
+}
+
 /* === Modals === */
 .modal-overlay {
   display: none;