feat: dropdown widgets vue node ui (#5624)

- Load media dropdown widgets
- Load models dropdown widgets

I added a lot of feedback effects during interactions.
I tried my best to break the Dropdown into small components.
To make it more flexible, I provided many configurable props and
v-model.

<img width="1000" alt="CleanShot 2025-09-18 at 01 54 38"
src="https://github.com/user-attachments/assets/1a413078-1547-44b8-8b48-1ce8f8e764b5"
/>

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5624-feat-dropdown-widgets-vue-node-ui-2716d73d36508115a52bc1fb6d6376d0)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Christian Byrne <cbyrne@comfy.org>

src/stores/nodeDefStore.ts

@@ -352,6 +352,16 @@ export const useNodeDefStore = defineStore('nodeDef', () => {
     return nodeDef
   }
 
+  function getInputSpecForWidget(
+    node: LGraphNode,
+    widgetName: string
+  ): InputSpecV2 | undefined {
+    const nodeDef = fromLGraphNode(node)
+    if (!nodeDef) return undefined
+
+    return nodeDef.inputs[widgetName]
+  }
+
   /**
    * Registers a node definition filter.
    * @param filter - The filter to register
@@ -424,6 +434,7 @@ export const useNodeDefStore = defineStore('nodeDef', () => {
     updateNodeDefs,
     addNodeDef,
     fromLGraphNode,
+    getInputSpecForWidget,
     registerNodeDefFilter,
     unregisterNodeDefFilter
   }