feat: tighten feature pulse flow and backend resilience

src/index.css

@@ -354,6 +354,7 @@ button.small {
 .column-header,
 .item-card-header,
 .meta-row,
+.feature-signal-row,
 .status-bar,
 .filters-heading {
   display: flex;
@@ -405,6 +406,26 @@ pre {
   gap: 0.65rem;
 }
 
+.feature-signal-row {
+  font-size: 0.82rem;
+  color: #9fb4d9;
+}
+
+.feature-signal {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 999px;
+  padding: 0.2rem 0.55rem;
+  background: rgba(96, 165, 250, 0.12);
+  color: #bfdbfe;
+}
+
+.feature-signal.quiet {
+  background: rgba(148, 163, 184, 0.1);
+  color: #cbd5e1;
+}
+
 .item-card select {
   min-width: 120px;
   padding: 0.5rem 0.7rem;
@@ -516,7 +537,8 @@ pre {
   .tab-bar,
   .button-row,
   .filter-row,
-  .status-bar {
+  .status-bar,
+  .feature-signal-row {
     flex-direction: column;
     align-items: stretch;
   }