feat: optimize empty search to use cached /nodes endpoint (#8159)

## Summary

Optimizes the Manager dialog to use the cached `GET /nodes` endpoint
instead of `GET /nodes/search` for empty search queries (when the dialog
first opens). This significantly reduces Algolia usage since empty
searches account for the majority of search requests.

## Changes

- **registrySearchProvider.ts**: Modified `searchPacks()` to detect
empty queries and route them to `listAllPacks()` instead of `search()`
- **registrySearchProvider.test.ts**: Added 5 new test cases covering
empty query behavior
- Cache clearing now clears both `search` and `listAllPacks` caches

## Technical Details

**Empty Query Flow (NEW):**
- Query: `""` or whitespace
- Endpoint: `GET /nodes?limit=X&page=Y`
- Cache: Server-side cached (via omitting `latest` parameter)
- Result: Fast, cached node pack list

**Non-Empty Query Flow (UNCHANGED):**
- Query: Any non-empty string
- Endpoint: `GET /nodes/search?search=X` or `comfy_node_search=X`
- Result: Search results as before

## Testing

```bash
pnpm test:unit -- src/services/providers/registrySearchProvider.test.ts
pnpm typecheck
```

src/services/providers/registrySearchProvider.test.ts

@@ -11,6 +11,8 @@ vi.mock('@/stores/comfyRegistryStore', () => ({
 describe('useComfyRegistrySearchProvider', () => {
   const mockSearchCall = vi.fn()
   const mockSearchClear = vi.fn()
+  const mockListAllPacksCall = vi.fn()
+  const mockListAllPacksClear = vi.fn()
 
   beforeEach(() => {
     vi.clearAllMocks()
@@ -20,6 +22,10 @@ describe('useComfyRegistrySearchProvider', () => {
       search: {
         call: mockSearchCall,
         clear: mockSearchClear
+      },
+      listAllPacks: {
+        call: mockListAllPacksCall,
+        clear: mockListAllPacksClear
       }
     } as any)
   })
@@ -111,14 +117,85 @@ describe('useComfyRegistrySearchProvider', () => {
       expect(result.nodePacks).toEqual([])
       expect(result.querySuggestions).toEqual([])
     })
+
+    it('should use listAllPacks for empty query', async () => {
+      const mockResults = {
+        nodes: [
+          { id: '1', name: 'Pack 1' },
+          { id: '2', name: 'Pack 2' }
+        ]
+      }
+      mockListAllPacksCall.mockResolvedValue(mockResults)
+
+      const provider = useComfyRegistrySearchProvider()
+      const result = await provider.searchPacks('', {
+        pageSize: 20,
+        pageNumber: 0
+      })
+
+      expect(mockListAllPacksCall).toHaveBeenCalledWith({
+        limit: 20,
+        page: 1
+      })
+      expect(mockSearchCall).not.toHaveBeenCalled()
+      expect(result.nodePacks).toEqual(mockResults.nodes)
+      expect(result.querySuggestions).toEqual([])
+    })
+
+    it('should use listAllPacks for whitespace-only query', async () => {
+      const mockResults = {
+        nodes: [{ id: '1', name: 'Pack 1' }]
+      }
+      mockListAllPacksCall.mockResolvedValue(mockResults)
+
+      const provider = useComfyRegistrySearchProvider()
+      const result = await provider.searchPacks('   ', {
+        pageSize: 10,
+        pageNumber: 0
+      })
+
+      expect(mockListAllPacksCall).toHaveBeenCalledWith({
+        limit: 10,
+        page: 1
+      })
+      expect(mockSearchCall).not.toHaveBeenCalled()
+      expect(result.nodePacks).toEqual(mockResults.nodes)
+    })
+
+    it('should handle empty results from listAllPacks', async () => {
+      mockListAllPacksCall.mockResolvedValue({ nodes: [] })
+
+      const provider = useComfyRegistrySearchProvider()
+      const result = await provider.searchPacks('', {
+        pageSize: 10,
+        pageNumber: 0
+      })
+
+      expect(result.nodePacks).toEqual([])
+      expect(result.querySuggestions).toEqual([])
+    })
+
+    it('should handle null results from listAllPacks', async () => {
+      mockListAllPacksCall.mockResolvedValue(null)
+
+      const provider = useComfyRegistrySearchProvider()
+      const result = await provider.searchPacks('', {
+        pageSize: 10,
+        pageNumber: 0
+      })
+
+      expect(result.nodePacks).toEqual([])
+      expect(result.querySuggestions).toEqual([])
+    })
   })
 
   describe('clearSearchCache', () => {
-    it('should delegate to store search.clear', () => {
+    it('should clear both search and listAllPacks caches', () => {
       const provider = useComfyRegistrySearchProvider()
       provider.clearSearchCache()
 
       expect(mockSearchClear).toHaveBeenCalled()
+      expect(mockListAllPacksClear).toHaveBeenCalled()
     })
   })
 

src/services/providers/registrySearchProvider.ts

@@ -25,33 +25,45 @@ export const useComfyRegistrySearchProvider = (): NodePackSearchProvider => {
   ): Promise<SearchPacksResult> => {
     const { pageSize, pageNumber, restrictSearchableAttributes } = params
 
-    // Determine search mode based on searchable attributes
+    // For empty queries, use the cached listAllPacks endpoint instead of search
+    if (!query || query.trim() === '') {
+      const listParams = {
+        limit: pageSize,
+        page: pageNumber + 1 // Registry API uses 1-based pagination
+        // Note: omitting 'latest' parameter defaults to cached result
+      }
+
+      const listResult = await registryStore.listAllPacks.call(listParams)
+      const nodePacks = listResult?.nodes ?? []
+
+      return {
+        nodePacks,
+        querySuggestions: []
+      }
+    }
+
+    // For non-empty queries, use the search endpoint
     const isNodeSearch = restrictSearchableAttributes?.includes('comfy_nodes')
 
     const searchParams = {
       search: isNodeSearch ? undefined : query,
       comfy_node_search: isNodeSearch ? query : undefined,
       limit: pageSize,
-      page: pageNumber + 1 // Registry API uses 1-based pagination
+      page: pageNumber + 1
     }
 
     const searchResult = await registryStore.search.call(searchParams)
-
-    if (!searchResult || !searchResult.nodes) {
-      return {
-        nodePacks: [],
-        querySuggestions: []
-      }
-    }
+    const nodePacks = searchResult?.nodes ?? []
 
     return {
-      nodePacks: searchResult.nodes,
+      nodePacks,
       querySuggestions: [] // Registry doesn't support query suggestions
     }
   }
 
   const clearSearchCache = () => {
     registryStore.search.clear()
+    registryStore.listAllPacks.clear()
   }
 
   const getSortValue = (