Add support for growable inputs (#6830)

![autogrow-optional_00002](https://github.com/user-attachments/assets/79bfe703-23d7-45fb-86ce-88baa9eaf582)

Also fixes connections to widget inputs created by a dynamic combo
breaking on reload.

Performs some refactoring to group the prior dynamic inputs code.

See also, the overarching frontend PR: comfyanonymous/ComfyUI#10832

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6830-Add-support-for-growable-inputs-2b36d73d365081c484ebc251a10aa6dd)
by [Unito](https://www.unito.io)

src/schemas/nodeDefSchema.ts

@@ -14,10 +14,6 @@ const zRemoteWidgetConfig = z.object({
   timeout: z.number().gte(0).optional(),
   max_retries: z.number().gte(0).optional()
 })
-const zWidgetTemplate = z.object({
-  template_id: z.string(),
-  allowed_types: z.string().optional()
-})
 const zMultiSelectOption = z.object({
   placeholder: z.string().optional(),
   chip: z.boolean().optional()
@@ -34,7 +30,6 @@ export const zBaseInputOptions = z
     hidden: z.boolean().optional(),
     advanced: z.boolean().optional(),
     widgetType: z.string().optional(),
-    template: zWidgetTemplate.optional(),
     /** Backend-only properties. */
     rawLink: z.boolean().optional(),
     lazy: z.boolean().optional()
@@ -232,9 +227,21 @@ export const zComfyNodeDef = z.object({
   input_order: z.record(z.array(z.string())).optional()
 })
 
+export const zAutogrowOptions = z.object({
+  ...zBaseInputOptions.shape,
+  template: z.object({
+    input: zComfyInputsSpec,
+    names: z.array(z.string()).optional(),
+    max: z.number().optional(),
+    //Backend defines as mandatory with min 1, Frontend is more forgiving
+    min: z.number().optional(),
+    prefix: z.string().optional()
+  })
+})
+
 export const zDynamicComboInputSpec = z.tuple([
   z.literal('COMFY_DYNAMICCOMBO_V3'),
-  zComboInputOptions.extend({
+  zBaseInputOptions.extend({
     options: z.array(
       z.object({
         inputs: zComfyInputsSpec,