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/workspace/nodeHelpStore.test.ts

@@ -2,6 +2,7 @@ import { createTestingPinia } from '@pinia/testing'
 import { setActivePinia } from 'pinia'
 import { beforeEach, describe, expect, it } from 'vitest'
 
+import type { ComfyNodeDefImpl } from '@/stores/nodeDefStore'
 import { useNodeHelpStore } from '@/stores/workspace/nodeHelpStore'
 
 describe('nodeHelpStore', () => {
@@ -27,7 +28,9 @@ describe('nodeHelpStore', () => {
   it('should open help for a node', () => {
     const nodeHelpStore = useNodeHelpStore()
 
-    nodeHelpStore.openHelp(mockCoreNode as any)
+    nodeHelpStore.openHelp(
+      mockCoreNode as Partial<ComfyNodeDefImpl> as ComfyNodeDefImpl
+    )
 
     expect(nodeHelpStore.currentHelpNode).toStrictEqual(mockCoreNode)
     expect(nodeHelpStore.isHelpOpen).toBe(true)
@@ -36,7 +39,9 @@ describe('nodeHelpStore', () => {
   it('should close help', () => {
     const nodeHelpStore = useNodeHelpStore()
 
-    nodeHelpStore.openHelp(mockCoreNode as any)
+    nodeHelpStore.openHelp(
+      mockCoreNode as Partial<ComfyNodeDefImpl> as ComfyNodeDefImpl
+    )
     expect(nodeHelpStore.isHelpOpen).toBe(true)
 
     nodeHelpStore.closeHelp()