feat(server): enhance workflow and script handling with new features

- Added `workflowLastModifiedAt` function to retrieve the last modified timestamp of workflow YAML files.
- Introduced `encodeBinaryForWire` and `reviveBinaryFromWire` functions for better handling of binary data in JSON.
- Implemented `useDeleteKv` hook for deleting key-value pairs in the web API.
- Enhanced `scriptsPluginFactory` to support dry-run evaluations with JSONata expressions.
- Added `set-dry-run-smoke.js` test to validate dry-run functionality.
- Updated profile configuration to include `overlayFromMerged` for better profile management.
- Introduced try-session management in the web components to handle step execution states.
- Improved various components to support new try-session features and maintain UI consistency.

Co-authored-by: Nasyarobby Putra <nasyarobby@gmail.com>

packages/server/fs-store.js

@@ -110,6 +110,31 @@ export function readWorkflowYaml(owner, file) {
   return fs.readFileSync(filePath, "utf8");
 }
 
+/**
+ * Last content change time for a workflow YAML file.
+ * Uses birthtime (creation) when the file has not been modified since it was created.
+ * @returns {string | null} ISO timestamp
+ */
+export function workflowLastModifiedAt(owner, file) {
+  try {
+    assertOwner(owner);
+    assertWorkflowFile(file);
+  } catch {
+    return null;
+  }
+  const filePath = path.join(WORKFLOWS_DIR, owner, file);
+  try {
+    const st = fs.statSync(filePath);
+    const birthMs = Number.isFinite(st.birthtimeMs) && st.birthtimeMs > 0 ? st.birthtimeMs : null;
+    const mtimeMs = Number.isFinite(st.mtimeMs) && st.mtimeMs > 0 ? st.mtimeMs : null;
+    const unmodified = birthMs != null && (mtimeMs == null || mtimeMs <= birthMs + 1000);
+    const ms = unmodified ? birthMs : (mtimeMs ?? birthMs);
+    return ms != null ? new Date(ms).toISOString() : null;
+  } catch {
+    return null;
+  }
+}
+
 export function writeWorkflowYaml(owner, file, content) {
   assertOwner(owner);
   assertWorkflowFile(file);