test: simplify test file mocking patterns (#8320)

Simplifies test mocking patterns across multiple test files.

- Removes redundant `vi.hoisted()` calls
- Cleans up mock implementations
- Removes unused imports and variables

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8320-test-simplify-test-file-mocking-patterns-2f46d73d36508150981bd8ecb99a6a11)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: GitHub Action <action@github.com>

src/lib/litegraph/src/LGraph.test.ts

@@ -46,12 +46,9 @@ describe('LGraph', () => {
     expect(graph.extra).toBe('TestGraph')
   })
 
-  test('is exactly the same type', async ({ expect }) => {
-    const directImport = await import('@/lib/litegraph/src/LGraph')
-    const entryPointImport = await import('@/lib/litegraph/src/litegraph')
-
-    expect(LiteGraph.LGraph).toBe(directImport.LGraph)
-    expect(LiteGraph.LGraph).toBe(entryPointImport.LGraph)
+  test('is exactly the same type', ({ expect }) => {
+    // LGraph from barrel export and LiteGraph.LGraph should be the same
+    expect(LiteGraph.LGraph).toBe(LGraph)
   })
 
   test('populates optional values', ({ expect, minimalSerialisableGraph }) => {