Add app

serving/kiosk-app/src/lib/live.svelte.js

@@ -0,0 +1,17 @@
+// Reactive "telemetry" helper: returns an object whose .value drifts around a
+// base value on an interval, so static dummy data feels like a live readout.
+// Call inside a component's script (it registers an $effect for cleanup).
+
+export function useJitter(base, { amp = 1, decimals = 0, every = 2000 } = {}) {
+  let value = $state(base)
+
+  $effect(() => {
+    const id = setInterval(() => {
+      const delta = (Math.random() - 0.5) * 2 * amp
+      value = Number((base + delta).toFixed(decimals))
+    }, every)
+    return () => clearInterval(id)
+  })
+
+  return { get value() { return value } }
+}