feat: overlay z-index fix, app name navigation, TPS on compact cards

- Bump overlay z-index to 100 so it renders above the sidebar
- App name in compact card navigates to /runtime/{slug} on click
- Add TPS (msg/s) as third metric on compact cards between live
  count and heartbeat

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/AgentHealth/AgentHealth.module.css

@@ -292,6 +292,12 @@
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
+  cursor: pointer;
+}
+
+.compactCardName:hover {
+  text-decoration: underline;
+  color: var(--running);
 }
 
 .compactCardChevron {
@@ -310,6 +316,11 @@
   color: var(--card-accent);
 }
 
+.compactCardTps {
+  font-family: var(--font-mono);
+  color: var(--text-muted);
+}
+
 .compactCardHeartbeat {
   color: var(--text-muted);
 }
@@ -326,7 +337,7 @@
 /* Expanded card overlay — floats from the clicked card */
 .compactGridExpanded {
   position: absolute;
-  z-index: 10;
+  z-index: 100;
   top: 0;
   left: 0;
   min-width: 500px;