refactor: config settings shown as badges with pencil-to-edit

Settings (log level, engine level, payload capture, metrics) now
display as color-coded badges by default. Clicking the pencil icon
enters edit mode where badges become dropdowns. Save (checkmark)
persists changes and reverts to badge view; cancel discards changes.

Applied consistently on both the admin App Config page and the
AgentHealth config bar.

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

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

@@ -94,6 +94,31 @@
   cursor: pointer;
 }
 
+.configEditBtn {
+  background: transparent;
+  border: none;
+  color: var(--text-faint);
+  opacity: 0.75;
+  cursor: pointer;
+  font-size: 14px;
+  padding: 4px 6px;
+  border-radius: var(--radius-sm);
+  line-height: 1;
+  display: inline-flex;
+  align-self: flex-end;
+  margin-left: auto;
+}
+
+.configEditBtn:hover {
+  color: var(--text-primary);
+  opacity: 1;
+}
+
+.configEditBtn:disabled {
+  opacity: 0.3;
+  cursor: not-allowed;
+}
+
 /* Section header */
 .sectionTitle {
   font-size: 13px;