Road to No Explicit Any Part 5: load3d Module (#8064)

## Summary
- Removes all `any` types from the load3d module
- Uses generics for EventCallback to provide type-safe event handling
- Types node parameters with LGraphNode
- Types onExecuted callback with NodeExecutionOutput
- Types Camera Config property casts with CameraConfig interface

## Changes
- `interfaces.ts`: EventCallback<T> generic, EventManagerInterface
generic methods
- `EventManager.ts`: Generic
emitEvent/addEventListener/removeEventListener
- `AnimationManager.ts`: setupModelAnimations originalModel typed as
GLTF union
- `Load3d.ts`: Event listener methods use EventCallback<T>
- `load3d.ts`: Node params typed as LGraphNode, onExecuted uses
NodeExecutionOutput, CameraConfig casts

## Test plan
- [x] `pnpm typecheck` passes
- [x] `pnpm lint` passes
- [x] `pnpm test:unit` passes

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8064-Road-to-No-Explicit-Any-Part-5-load3d-Module-2e96d73d365081efbc01f2d8a4f3c11f)
by [Unito](https://www.unito.io)

src/composables/useLoad3d.ts

@@ -9,6 +9,7 @@ import type {
   CameraConfig,
   CameraState,
   CameraType,
+  EventCallback,
   LightConfig,
   MaterialMode,
   ModelConfig,
@@ -564,7 +565,7 @@ export const useLoad3d = (nodeOrRef: MaybeRef<LGraphNode | null>) => {
   const handleEvents = (action: 'add' | 'remove') => {
     Object.entries(eventConfig).forEach(([event, handler]) => {
       const method = `${action}EventListener` as const
-      load3d?.[method](event, handler)
+      load3d?.[method](event, handler as EventCallback)
     })
   }