Allow to insert into loop step ids (#14425)

- Create empty node on iterator creation
- Add options on step creation to insert in loop
- Handle properly when a step is removed from loop
- Remove loopNextStepIds from frontend action
- Add a frontend skeleton for empty action



https://github.com/user-attachments/assets/281a8c15-8062-4702-afb4-0d9a50902252

packages/twenty-shared/src/workflow/index.ts

@@ -25,6 +25,7 @@ export {
   workflowAiAgentActionSettingsSchema,
   workflowFilterActionSettingsSchema,
   workflowIteratorActionSettingsSchema,
+  workflowEmptyActionSettingsSchema,
   workflowCodeActionSchema,
   workflowSendEmailActionSchema,
   workflowCreateRecordActionSchema,
@@ -36,6 +37,7 @@ export {
   workflowAiAgentActionSchema,
   workflowFilterActionSchema,
   workflowIteratorActionSchema,
+  workflowEmptyActionSchema,
   workflowActionSchema,
   workflowDatabaseEventTriggerSchema,
   workflowManualTriggerSchema,

packages/twenty-shared/src/workflow/schemas/workflow.schema.ts

@@ -223,11 +223,15 @@ export const workflowIteratorActionSettingsSchema =
   baseWorkflowActionSettingsSchema.extend({
     input: z.object({
       items: z.union([z.array(z.union([z.string(), z.number(), z.boolean(), z.null(), z.record(z.any()), z.any()])), z.string()]).optional(),
-      // TODO: should never be a string once fix the UI
-      initialLoopStepIds: z.union([z.array(z.string()), z.string()]).optional(),
+      initialLoopStepIds: z.array(z.string()).optional(),
     }),
   });
 
+export const workflowEmptyActionSettingsSchema =
+  baseWorkflowActionSettingsSchema.extend({
+    input: z.object({}),
+  });
+
 // Action schemas
 export const workflowCodeActionSchema = baseWorkflowActionSchema.extend({
   type: z.literal('CODE'),
@@ -284,6 +288,11 @@ export const workflowIteratorActionSchema = baseWorkflowActionSchema.extend({
   settings: workflowIteratorActionSettingsSchema,
 });
 
+export const workflowEmptyActionSchema = baseWorkflowActionSchema.extend({
+  type: z.literal('EMPTY'),
+  settings: workflowEmptyActionSettingsSchema,
+});
+
 // Combined action schema
 export const workflowActionSchema = z.discriminatedUnion('type', [
   workflowCodeActionSchema,
@@ -297,6 +306,7 @@ export const workflowActionSchema = z.discriminatedUnion('type', [
   workflowAiAgentActionSchema,
   workflowFilterActionSchema,
   workflowIteratorActionSchema,
+  workflowEmptyActionSchema,
 ]);
 
 // Trigger schemas