Chore: Upgrade Vitest to v4 (#7797)

## Summary

https://vitest.dev/guide/migration.html#vitest-4

## Changes

- **What**: Update Vitest and some associated dependencies
- **What**: Fix issue with our existing mocks and mock types

## Review Focus

Double check the test updates. I tried to keep the changes minimal.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7797-Chore-Upgrade-Vitest-to-v4-2d96d73d3650810cbe3ac42d7bd6585a)
by [Unito](https://www.unito.io)

---------

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

tests-ui/tests/litegraph/core/LinkConnector.integration.test.ts

@@ -1,21 +1,21 @@
 // TODO: Fix these tests after migration
 import { afterEach, describe, expect, vi } from 'vitest'
 
-import type { LGraph, Reroute } from '@/lib/litegraph/src/litegraph'
-import {
-  type CanvasPointerEvent,
-  LGraphNode,
-  LLink,
-  LinkConnector,
-  type RerouteId
+import type {
+  LGraph,
+  Reroute,
+  CanvasPointerEvent,
+  RerouteId
 } from '@/lib/litegraph/src/litegraph'
+import { LGraphNode, LLink, LinkConnector } from '@/lib/litegraph/src/litegraph'
 
 import { test as baseTest } from './fixtures/testExtensions'
+import type { ConnectingLink } from '@/lib/litegraph/src/interfaces'
 
 interface TestContext {
   graph: LGraph
   connector: LinkConnector
-  setConnectingLinks: ReturnType<typeof vi.fn>
+  setConnectingLinks: (value: ConnectingLink[]) => void
   createTestNode: (id: number) => LGraphNode
   reroutesBeforeTest: [rerouteId: RerouteId, reroute: Reroute][]
   validateIntegrityNoChanges: () => void
@@ -41,9 +41,8 @@ const test = baseTest.extend<TestContext>({
     await use(reroutesComplexGraph)
   },
   setConnectingLinks: async (
-    // eslint-disable-next-line no-empty-pattern
     {},
-    use: (mock: ReturnType<typeof vi.fn>) => Promise<void>
+    use: (mock: (value: ConnectingLink[]) => void) => Promise<void>
   ) => {
     const mock = vi.fn()
     await use(mock)

tests-ui/tests/litegraph/core/LinkConnector.test.ts

@@ -1,23 +1,26 @@
 import { test as baseTest, describe, expect, vi } from 'vitest'
 
-import { LinkConnector } from '@/lib/litegraph/src/litegraph'
-import type { MovingInputLink } from '@/lib/litegraph/src/litegraph'
-import { ToInputRenderLink } from '@/lib/litegraph/src/litegraph'
-import type { LinkNetwork } from '@/lib/litegraph/src/litegraph'
-import type { ISlotType } from '@/lib/litegraph/src/litegraph'
+import type {
+  MovingInputLink,
+  RerouteId,
+  LinkNetwork,
+  ISlotType
+} from '@/lib/litegraph/src/litegraph'
 import {
   LGraph,
   LGraphNode,
   LLink,
   Reroute,
-  type RerouteId
+  LinkConnector,
+  ToInputRenderLink,
+  LinkDirection
 } from '@/lib/litegraph/src/litegraph'
-import { LinkDirection } from '@/lib/litegraph/src/litegraph'
+import type { ConnectingLink } from '@/lib/litegraph/src/interfaces'
 
 interface TestContext {
   network: LinkNetwork & { add(node: LGraphNode): void }
   connector: LinkConnector
-  setConnectingLinks: ReturnType<typeof vi.fn>
+  setConnectingLinks: (value: ConnectingLink[]) => void
   createTestNode: (id: number, slotType?: ISlotType) => LGraphNode
   createTestLink: (
     id: number,
@@ -28,7 +31,6 @@ interface TestContext {
 }
 
 const test = baseTest.extend<TestContext>({
-  // eslint-disable-next-line no-empty-pattern
   network: async ({}, use) => {
     const graph = new LGraph()
     const floatingLinks = new Map<number, LLink>()
@@ -53,9 +55,8 @@ const test = baseTest.extend<TestContext>({
   },
 
   setConnectingLinks: async (
-    // eslint-disable-next-line no-empty-pattern
     {},
-    use: (mock: ReturnType<typeof vi.fn>) => Promise<void>
+    use: (mock: (value: ConnectingLink[]) => void) => Promise<void>
   ) => {
     const mock = vi.fn()
     await use(mock)