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/platform/nodeReplacement/missingNodeScan.test.ts

@@ -1,3 +1,4 @@
+import { fromAny, fromPartial } from '@total-typescript/shoehorn'
 import { createPinia, setActivePinia } from 'pinia'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
@@ -58,16 +59,16 @@ function mockNode(
   type: string,
   overrides: Partial<LGraphNode> = {}
 ): LGraphNode {
-  return {
+  return fromAny<LGraphNode, unknown>({
     id,
     type,
     last_serialization: { type },
     ...overrides
-  } as unknown as LGraphNode
+  })
 }
 
 function mockGraph(): LGraph {
-  return {} as unknown as LGraph
+  return fromAny<LGraph, unknown>({})
 }
 
 function getMissingNodesError(
@@ -216,9 +217,9 @@ describe('scanMissingNodes (via rescanAndSurfaceMissingNodes)', () => {
 
   it('uses last_serialization.type over node.type', () => {
     const node = mockNode(1, 'LiveType')
-    node.last_serialization = {
+    node.last_serialization = fromPartial<LGraphNode['last_serialization']>({
       type: 'OriginalType'
-    } as unknown as LGraphNode['last_serialization']
+    })
     vi.mocked(collectAllNodes).mockReturnValue([node])
     vi.mocked(getExecutionIdByNode).mockReturnValue(null)