Road to No Explicit Any Part 4: LiteGraph Cleanup (#7970)

## Summary
- Remove all remaining `any` types from LiteGraph module
- Define proper `Panel` interface for createPanel function and related
callbacks
- Type `SlotTypeDefaultNodeOpts` for slot type defaults configuration
- Fix type inference issues in sendActionToCanvas and contextMenuCompat

## Changes
- **SubgraphIONodeBase.ts**: Remove unnecessary `as any` cast in
showSlotContextMenu
- **interfaces.ts**: Add Panel, PanelButton, PanelWidget,
PanelWidgetOptions, PanelWidgetCallback types
- **LGraphNode.ts**: Type panel callbacks (onShowCustomPanelInfo,
onAddPropertyToPanel) and onGetPropertyInfo
- **LGraphCanvas.ts**: 
  - Type node_panel and options_panel as Panel
  - Type inner_clicked callback parameters
- Type local variables (nodeNewType, nodeNewOpts, prevent_timeout, iS,
sIn, sOut)
  - Add SlotTypeDefaultNodeOpts interface for slot type configuration
- **LGraph.ts**: Fix sendActionToCanvas type inference with proper array
handling
- **contextMenuCompat.ts**: Add null guard for newImpl parameter

## Test plan
- [x] pnpm typecheck passes
- [x] pnpm lint passes
- [x] knip passes (no unused exports)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7970-Road-to-No-Explicit-Any-Part-4-LiteGraph-Cleanup-2e66d73d3650812c939bf9b2cb0ff2f5)
by [Unito](https://www.unito.io)

---------

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

src/lib/litegraph/src/LGraphNode.ts

@@ -41,6 +41,7 @@ import type {
   INodeSlotContextItem,
   IPinnable,
   ISlotType,
+  Panel,
   Point,
   Positionable,
   ReadOnlyRect,
@@ -96,9 +97,12 @@ export type NodeId = number | string
 export type NodeProperty = string | number | boolean | object
 
 interface INodePropertyInfo {
-  name: string
+  name?: string
   type?: string
-  default_value: NodeProperty | undefined
+  default_value?: NodeProperty
+  widget?: string
+  label?: string
+  values?: TWidgetValue[]
 }
 
 interface IMouseOverData {
@@ -606,8 +610,8 @@ export class LGraphNode
     target_slot: number,
     requested_slot?: number | string
   ): number | false | null
-  onShowCustomPanelInfo?(this: LGraphNode, panel: any): void
-  onAddPropertyToPanel?(this: LGraphNode, pName: string, panel: any): boolean
+  onShowCustomPanelInfo?(this: LGraphNode, panel: Panel): void
+  onAddPropertyToPanel?(this: LGraphNode, pName: string, panel: Panel): boolean
   onWidgetChanged?(
     this: LGraphNode,
     name: string,
@@ -667,8 +671,7 @@ export class LGraphNode
     index: number,
     e: CanvasPointerEvent
   ): void
-  // TODO: Return type
-  onGetPropertyInfo?(this: LGraphNode, property: string): any
+  onGetPropertyInfo?(this: LGraphNode, property: string): INodePropertyInfo
   onNodeOutputAdd?(this: LGraphNode, value: unknown): void
   onNodeInputAdd?(this: LGraphNode, value: unknown): void
   onMenuNodeInputs?(