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/renderer/extensions/vueNodes/components/NodeWidgets.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 { nextTick } from 'vue'
@@ -8,11 +9,10 @@ import type {
   SafeWidgetData,
   VueNodeData
 } from '@/composables/graph/useGraphNodeManager'
+import NodeWidgets from '@/renderer/extensions/vueNodes/components/NodeWidgets.vue'
 import { usePromotionStore } from '@/stores/promotionStore'
 import { useWidgetValueStore } from '@/stores/widgetValueStore'
 
-import NodeWidgets from '@/renderer/extensions/vueNodes/components/NodeWidgets.vue'
-
 vi.mock('@/renderer/core/canvas/canvasStore', () => ({
   useCanvasStore: () => ({
     canvas: {
@@ -79,8 +79,8 @@ describe('NodeWidgets', () => {
   }
 
   const getBorderStyles = (wrapper: ReturnType<typeof mount>) =>
-    (
-      wrapper.vm as unknown as { processedWidgets: unknown[] }
+    fromAny<{ processedWidgets: unknown[] }, unknown>(
+      wrapper.vm
     ).processedWidgets.map(
       (entry) =>
         (