feat: add chat based testing for voice agent (#308)

* feat: add backend foundations

* feat: add text chat UI

* chore: simplify the reload behaviour

* fix: fix upgrade banner to be triggered after package upload

* feat: simplify TesterPanel design

* chore: fix formatting and generate client

* chore: fix tracing for text chat mode

* fix: fix revert and edit CTA

* refactor: refactor TesterPanel into smaller components

* feat: enable runtime transition of nodes

* fix: fix review comments

ui/src/components/workflow/conversation/utils.ts

@@ -0,0 +1,21 @@
+import type { ConversationItem } from "./types";
+
+export function formatConversationValue(value: unknown) {
+    if (value == null) {
+        return "None";
+    }
+    if (typeof value === "string") {
+        return value;
+    }
+    try {
+        return JSON.stringify(value, null, 2);
+    } catch {
+        return String(value);
+    }
+}
+
+export function countConversationMessages(items: ConversationItem[]) {
+    return items.filter(
+        (item) => item.kind === "message" && item.tone !== "muted",
+    ).length;
+}