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/rightSidePanel/parameters/WidgetItem.test.ts

@@ -1,4 +1,5 @@
 import { createTestingPinia } from '@pinia/testing'
+import { fromAny } from '@total-typescript/shoehorn'
 import { mount } from '@vue/test-utils'
 import { setActivePinia } from 'pinia'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
@@ -72,13 +73,13 @@ const i18n = createI18n({
 })
 
 function createMockNode(overrides: Partial<LGraphNode> = {}): LGraphNode {
-  return {
+  return fromAny<LGraphNode, unknown>({
     id: 1,
     type: 'TestNode',
     isSubgraphNode: () => false,
     graph: { rootGraph: { id: 'test-graph-id' } },
     ...overrides
-  } as unknown as LGraphNode
+  })
 }
 
 function createMockWidget(overrides: Partial<IBaseWidget> = {}): IBaseWidget {
@@ -128,7 +129,7 @@ function createMockPromotedWidgetView(
       return 0
     }
   }
-  return new MockPromotedWidgetView() as unknown as IBaseWidget
+  return fromAny<IBaseWidget, unknown>(new MockPromotedWidgetView())
 }
 
 function mountWidgetItem(