fix(ui): restore proper correlation chain styling with StatusDot, route names, colored borders

ui/src/pages/Exchanges/ExchangeHeader.module.css

@@ -0,0 +1,93 @@
+.header {
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+  padding: 0.75rem;
+  border-bottom: 1px solid var(--border);
+  background: var(--surface);
+  font-size: 0.8125rem;
+}
+
+.summary {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  flex-wrap: wrap;
+}
+
+.duration {
+  margin-left: auto;
+  font-family: var(--font-mono);
+  font-size: 0.75rem;
+}
+
+/* ── Correlation chain ────────────────────────────────────────────────────── */
+
+.chain {
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  gap: 8px;
+  padding-top: 8px;
+  margin-top: 4px;
+  border-top: 1px solid var(--border-subtle);
+  flex-wrap: wrap;
+}
+
+.chainLabel {
+  font-size: 10px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+  color: var(--text-muted);
+  margin-right: 4px;
+}
+
+.chainNode {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  padding: 4px 10px;
+  border-radius: var(--radius-sm);
+  border: 1px solid var(--border-subtle);
+  font-size: 11px;
+  font-family: var(--font-mono);
+  cursor: pointer;
+  background: var(--bg-surface);
+  color: var(--text-secondary);
+  transition: all 0.12s;
+}
+
+.chainNode:hover {
+  border-color: var(--text-faint);
+  background: var(--bg-hover);
+}
+
+.chainNodeCurrent {
+  background: var(--amber-bg);
+  border-color: var(--amber-light);
+  color: var(--amber-deep);
+  font-weight: 600;
+}
+
+.chainNodeSuccess {
+  border-left: 3px solid var(--success);
+}
+
+.chainNodeError {
+  border-left: 3px solid var(--error);
+}
+
+.chainNodeRunning {
+  border-left: 3px solid var(--running);
+}
+
+.chainNodeWarning {
+  border-left: 3px solid var(--warning);
+}
+
+.chainMore {
+  color: var(--text-muted);
+  font-size: 11px;
+  font-style: italic;
+}