fix(autocomplete): resolve instability in Vue DOM mode and fix WanVideo node binding

- Fix infinite reinitialization loop by only validating stale widget.inputEl when it's actually in DOM
- Improve findWidgetInputElement to specifically search for textarea for text widgets, avoiding mismatches with checkbox inputs on nodes like WanVideo Lora Select that have toggle switches
- Add data-node-id based element search as primary strategy for better reliability across rendering modes
- Fix autocomplete initialization to properly handle element DOM state transitions

Fixes autocomplete failing after Canvas ↔ Vue DOM mode switches and WanVideo node always failing to trigger autocomplete.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

web/comfyui/prompt.js

@@ -26,4 +26,19 @@ app.registerExtension({
       });
     }
   },
+  async loadedGraphNode(node) {
+    if (node.comfyClass == "Prompt (LoraManager)") {
+      const textWidget = node.widgets?.[0];
+      if (textWidget && !node.autocomplete) {
+        const { setupInputWidgetWithAutocomplete } = await import("./utils.js");
+        const modelType = "embeddings";
+        const autocompleteOptions = {
+          maxItems: 20,
+          minChars: 1,
+          debounceDelay: 200,
+        };
+        textWidget.callback = setupInputWidgetWithAutocomplete(node, textWidget, textWidget.callback, modelType, autocompleteOptions);
+      }
+    }
+  },
 });