test: migrate as unknown as to @total-typescript/shoehorn (#10761)

*PR Created by the Glary-Bot Agent*

---

## Summary

- Replace all `as unknown as Type` assertions in 59 unit test files with
type-safe `@total-typescript/shoehorn` functions
- Use `fromPartial<Type>()` for partial mock objects where deep-partial
type-checks (21 files)
- Use `fromAny<Type>()` for fundamentally incompatible types: null,
undefined, primitives, variables, class expressions, and mocks with
test-specific extra properties that `PartialDeepObject` rejects
(remaining files)
- All explicit type parameters preserved so TypeScript return types are
correct
- Browser test `.spec.ts` files excluded (shoehorn unavailable in
`page.evaluate` browser context)

## Verification

- `pnpm typecheck` ✅
- `pnpm lint` ✅
- `pnpm format` ✅
- Pre-commit hooks passed (format + oxlint + eslint + typecheck)
- Migrated test files verified passing (ran representative subset)
- No test behavior changes — only type assertion syntax changed
- No UI changes — screenshots not applicable

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-10761-test-migrate-as-unknown-as-to-total-typescript-shoehorn-3336d73d365081f6b8adc44db5dcc380)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Glary-Bot <glary-bot@users.noreply.github.com>
Co-authored-by: Amp <amp@ampcode.com>

src/components/graph/widgets/DomWidget.test.ts

@@ -1,14 +1,14 @@
-import { mount } from '@vue/test-utils'
 import { createTestingPinia } from '@pinia/testing'
+import { fromPartial } from '@total-typescript/shoehorn'
+import { mount } from '@vue/test-utils'
 import { setActivePinia } from 'pinia'
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { reactive } from 'vue'
 
-import { createMockLGraphNode } from '@/utils/__tests__/litegraphTestUtils'
 import type { BaseDOMWidget } from '@/scripts/domWidget'
 import type { DomWidgetState } from '@/stores/domWidgetStore'
 import { useDomWidgetStore } from '@/stores/domWidgetStore'
-
+import { createMockLGraphNode } from '@/utils/__tests__/litegraphTestUtils'
 import DomWidget from './DomWidget.vue'
 
 const mockUpdatePosition = vi.fn()
@@ -63,7 +63,7 @@ function createWidgetState(overrideDisabled: boolean): DomWidgetState {
     }
   })
 
-  const widget = {
+  const widget = fromPartial<BaseDOMWidget<object | string>>({
     id: 'dom-widget-id',
     name: 'test_widget',
     type: 'custom',
@@ -71,7 +71,7 @@ function createWidgetState(overrideDisabled: boolean): DomWidgetState {
     options: {},
     node,
     computedDisabled: false
-  } as unknown as BaseDOMWidget<object | string>
+  })
 
   domWidgetStore.registerWidget(widget)
   domWidgetStore.setPositionOverride(widget.id, {