fix: progressive hierarchical fallback and HF-download node dropdowns

1. Fix findProvidersWithFallback to try all intermediate parent paths
   (a/b/c → a/b → a) instead of jumping to top-level only. This
   ensures "Use" on CogVideo/ControlNet/* models creates the correct
   DownloadAndLoadCogVideoControlNet node.

2. Use empty key for DownloadAndLoadCogVideoControlNet and
   DownloadAndLoadCogVideoModel so the asset browser doesn't hijack
   the combo widget — these nodes use HF repo names, not file assets.

3. Add comprehensive tests for 1-4 level nested path fallback.

src/stores/modelToNodeStore.test.ts

@@ -178,6 +178,71 @@ describe('useModelToNodeStore', () => {
       ).toBeUndefined()
     })
 
+    describe('progressive hierarchical fallback', () => {
+      it('should resolve 1-level path via exact match', () => {
+        const modelToNodeStore = useModelToNodeStore()
+        modelToNodeStore.quickRegister('level1', 'UNETLoader', 'key1')
+
+        const provider = modelToNodeStore.getNodeProvider('level1')
+        expect(provider?.nodeDef?.name).toBe('UNETLoader')
+      })
+
+      it('should resolve 2-level path to registered parent', () => {
+        const modelToNodeStore = useModelToNodeStore()
+        modelToNodeStore.quickRegister('level1', 'UNETLoader', 'key1')
+
+        const provider = modelToNodeStore.getNodeProvider('level1/child')
+        expect(provider?.nodeDef?.name).toBe('UNETLoader')
+      })
+
+      it('should resolve 3-level path to nearest registered ancestor', () => {
+        const modelToNodeStore = useModelToNodeStore()
+        modelToNodeStore.quickRegister('level1', 'UNETLoader', 'key1')
+        modelToNodeStore.quickRegister('level1/level2', 'VAELoader', 'key2')
+
+        // 3 levels: should match level1/level2 (nearest), not level1
+        const provider = modelToNodeStore.getNodeProvider('level1/level2/child')
+        expect(provider?.nodeDef?.name).toBe('VAELoader')
+      })
+
+      it('should resolve 4-level path to nearest registered ancestor', () => {
+        const modelToNodeStore = useModelToNodeStore()
+        modelToNodeStore.quickRegister('a', 'UNETLoader', 'k1')
+        modelToNodeStore.quickRegister('a/b', 'VAELoader', 'k2')
+        modelToNodeStore.quickRegister('a/b/c', 'StyleModelLoader', 'k3')
+
+        // 4 levels: should match a/b/c (nearest), not a/b or a
+        const provider = modelToNodeStore.getNodeProvider('a/b/c/d')
+        expect(provider?.nodeDef?.name).toBe('StyleModelLoader')
+      })
+
+      it('should skip intermediate unregistered levels', () => {
+        const modelToNodeStore = useModelToNodeStore()
+        modelToNodeStore.quickRegister('a', 'UNETLoader', 'k1')
+        // a/b is NOT registered
+
+        // 3 levels: a/b not found, falls back to a
+        const provider = modelToNodeStore.getNodeProvider('a/b/c')
+        expect(provider?.nodeDef?.name).toBe('UNETLoader')
+      })
+
+      it('should prefer exact match over any fallback', () => {
+        const modelToNodeStore = useModelToNodeStore()
+        modelToNodeStore.quickRegister('a', 'UNETLoader', 'k1')
+        modelToNodeStore.quickRegister('a/b/c', 'VAELoader', 'k2')
+
+        const provider = modelToNodeStore.getNodeProvider('a/b/c')
+        expect(provider?.nodeDef?.name).toBe('VAELoader')
+      })
+
+      it('should return undefined when no ancestor is registered', () => {
+        const modelToNodeStore = useModelToNodeStore()
+        modelToNodeStore.quickRegister('x', 'UNETLoader', 'k1')
+
+        expect(modelToNodeStore.getNodeProvider('y/z/w')).toBeUndefined()
+      })
+    })
+
     it('should return provider for chatterbox nodes with empty key', () => {
       const modelToNodeStore = useModelToNodeStore()
       modelToNodeStore.registerDefaults()

src/stores/modelToNodeStore.ts

@@ -75,8 +75,8 @@ export const useModelToNodeStore = defineStore('modelToNode', () => {
 
   /**
    * Find providers for modelType with hierarchical fallback.
-   * Tries exact match first, then falls back to top-level segment (e.g., "parent/child" → "parent").
-   * Note: Only falls back one level; "a/b/c" tries "a/b/c" then "a", not "a/b".
+   * Tries exact match first, then progressively shorter parent paths.
+   * e.g., "a/b/c" tries "a/b/c" → "a/b" → "a".
    */
   function findProvidersWithFallback(
     modelType: string
@@ -88,12 +88,12 @@ export const useModelToNodeStore = defineStore('modelToNode', () => {
     const exactMatch = modelToNodeMap.value[modelType]
     if (exactMatch && exactMatch.length > 0) return exactMatch
 
-    const topLevel = modelType.split('/')[0]
-    if (topLevel === modelType) return undefined
-
-    const fallback = modelToNodeMap.value[topLevel]
-
-    if (fallback && fallback.length > 0) return fallback
+    const segments = modelType.split('/')
+    for (let i = segments.length - 1; i >= 1; i--) {
+      const parentPath = segments.slice(0, i).join('/')
+      const fallback = modelToNodeMap.value[parentPath]
+      if (fallback && fallback.length > 0) return fallback
+    }
 
     return undefined
   }
@@ -361,10 +361,11 @@ export const useModelToNodeStore = defineStore('modelToNode', () => {
 
     // CogVideoX models (comfyui-cogvideoxwrapper)
     quickRegister('CogVideo/GGUF', 'DownloadAndLoadCogVideoGGUFModel', 'model')
+    // Empty key: HF-download node — don't activate asset browser for the combo widget
     quickRegister(
       'CogVideo/ControlNet',
       'DownloadAndLoadCogVideoControlNet',
-      'model'
+      ''
     )
 
     // DynamiCrafter models (ComfyUI-DynamiCrafterWrapper)
@@ -386,7 +387,8 @@ export const useModelToNodeStore = defineStore('modelToNode', () => {
     quickRegister('lama', 'LaMa', 'lama_model')
 
     // CogVideoX video generation models (comfyui-cogvideoxwrapper)
-    quickRegister('CogVideo', 'DownloadAndLoadCogVideoModel', 'model')
+    // Empty key: HF-download node — don't activate asset browser for the combo widget
+    quickRegister('CogVideo', 'DownloadAndLoadCogVideoModel', '')
 
     // Inpaint models (comfyui-inpaint-nodes)
     quickRegister('inpaint', 'INPAINT_LoadInpaintModel', 'model_name')