Fix JS loading - add WEB_DIRECTORY and absolute imports

- Added WEB_DIRECTORY = "./web" to __init__.py (required for ComfyUI to find JS)
- Added __all__ export
- Changed JS imports to absolute paths (/scripts/app.js)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

__init__.py

@@ -137,3 +137,6 @@ NODE_DISPLAY_NAME_MAPPINGS = {
     "ListVariables": "List Variables",
     "ClearVariables": "Clear Variables",
 }
+
+WEB_DIRECTORY = "./web"
+__all__ = ["NODE_CLASS_MAPPINGS", "NODE_DISPLAY_NAME_MAPPINGS", "WEB_DIRECTORY"]

web/simplevariables.js

@@ -1,5 +1,5 @@
-import { app } from "../../scripts/app.js";
-import { ComfyWidgets } from "../../scripts/widgets.js";
+import { app } from "/scripts/app.js";
+import { ComfyWidgets } from "/scripts/widgets.js";
 
 function displayText(nodeType, nodeData, appInstance) {
     const onExecutedOriginal = nodeType.prototype.onExecuted;