Road to No explicit any: Group 8 (part 7) test files (#8459)

## Summary

This PR removes unsafe type assertions ("as unknown as Type") from test
files and improves type safety across the codebase.

### Key Changes

#### Type Safety Improvements
- Removed improper `as unknown as Type` patterns from 17 test files in
Group 8 part 7
- Replaced with proper TypeScript patterns using factory functions and
Mock types
- Fixed createTestingPinia usage in test files (was incorrectly using
createPinia)
- Fixed vi.hoisted pattern for mockSetDirty in viewport tests  
- Fixed vi.doMock lint issues with vi.mock and vi.hoisted pattern
- Retained necessary `as unknown as` casts only for complex mock objects
where direct type assertions would fail

### Files Changed

Test files (Group 8 part 7 - services, stores, utils):
- src/services/nodeOrganizationService.test.ts
- src/services/providers/algoliaSearchProvider.test.ts
- src/services/providers/registrySearchProvider.test.ts
- src/stores/comfyRegistryStore.test.ts
- src/stores/domWidgetStore.test.ts
- src/stores/executionStore.test.ts
- src/stores/firebaseAuthStore.test.ts
- src/stores/modelToNodeStore.test.ts
- src/stores/queueStore.test.ts
- src/stores/subgraphNavigationStore.test.ts
- src/stores/subgraphNavigationStore.viewport.test.ts
- src/stores/subgraphStore.test.ts
- src/stores/systemStatsStore.test.ts
- src/stores/workspace/nodeHelpStore.test.ts
- src/utils/colorUtil.test.ts
- src/utils/executableGroupNodeChildDTO.test.ts

Source files:
- src/stores/modelStore.ts - Improved type handling

### Testing
- All TypeScript type checking passes (`pnpm typecheck`)
- All affected test files pass (`pnpm test:unit`)
- Linting passes without errors (`pnpm lint`)
- Code formatting applied (`pnpm format`)

Part of the "Road to No Explicit Any" initiative, cleaning up type
casting issues from branch `fix/remove-any-types-part8`.

### Previous PRs in this series:
- Part 2: #7401
- Part 3: #7935
- Part 4: #7970
- Part 5: #8064
- Part 6: #8083
- Part 7: #8092
- Part 8 Group 1: #8253
- Part 8 Group 2: #8258
- Part 8 Group 3: #8304
- Part 8 Group 4: #8314
- Part 8 Group 5: #8329
- Part 8 Group 6: #8344
- Part 8 Group 7: #8459 (this PR)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8459-Road-to-No-explicit-any-Group-8-part-7-test-files-2f86d73d36508114ad28d82e72a3a5e9)
by [Unito](https://www.unito.io)

src/stores/systemStatsStore.test.ts

@@ -2,6 +2,7 @@ import { createTestingPinia } from '@pinia/testing'
 import { setActivePinia } from 'pinia'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
+import type { SystemStats } from '@/schemas/apiSchema'
 import { api } from '@/scripts/api'
 import { useSystemStatsStore } from '@/stores/systemStatsStore'
 import { isElectron } from '@/utils/envUtil'
@@ -25,7 +26,7 @@ describe('useSystemStatsStore', () => {
 
   beforeEach(() => {
     // Mock API to prevent automatic fetch on store creation
-    vi.mocked(api.getSystemStats).mockResolvedValue(null as any)
+    vi.mocked(api.getSystemStats).mockResolvedValue(null!)
     setActivePinia(createTestingPinia({ stubActions: false }))
     store = useSystemStatsStore()
     vi.clearAllMocks()
@@ -90,8 +91,8 @@ describe('useSystemStatsStore', () => {
     })
 
     it('should set loading state correctly', async () => {
-      let resolvePromise: (value: any) => void = () => {}
-      const promise = new Promise<any>((resolve) => {
+      let resolvePromise: (value: SystemStats) => void = () => {}
+      const promise = new Promise<SystemStats>((resolve) => {
         resolvePromise = resolve
       })
       vi.mocked(api.getSystemStats).mockReturnValue(promise)
@@ -99,7 +100,7 @@ describe('useSystemStatsStore', () => {
       const fetchPromise = store.refetchSystemStats()
       expect(store.isLoading).toBe(true)
 
-      resolvePromise({})
+      resolvePromise({} as SystemStats)
       await fetchPromise
 
       expect(store.isLoading).toBe(false)
@@ -153,7 +154,7 @@ describe('useSystemStatsStore', () => {
           argv: [],
           ram_total: 16000000000,
           ram_free: 8000000000
-        } as any,
+        } as Partial<SystemStats['system']> as SystemStats['system'],
         devices: []
       }