big overhaul for server and webui feature matching, things default to disabled and disappear from UI when disabled.

webui/src/lib/features.js

@@ -0,0 +1,15 @@
+// Feature Helpers
+// Purpose: Centralizes client-side reads of server-advertised optional features.
+// Scope: Keeps layout/components from each inventing their own "is this feature configured?" rule.
+export function isFeatureEnabled(state, featureName) {
+  /*
+    The server owns feature detection because only it can reliably know whether
+    config-driven hardware integrations exist. React should treat missing flags
+    as disabled so old or partial session payloads fail closed and hide extras.
+  */
+  return Boolean(state?.session?.features?.[featureName]);
+}
+
+export function anyFeatureEnabled(state, featureNames = []) {
+  return featureNames.some((featureName) => isFeatureEnabled(state, featureName));
+}