Cleanup: Removing monkeypatches for litegraph logic (#5902)

## Summary

Putting the litegraph specific pieces into litegraph itself, using the
CanvasGraph and LiteGraphGlobal to coordinate options.

This was one part of the Image Previews reloading/calculating with every
canvas draw.

## Review Focus

Is this keeping things decoupled enough?
Is this the right place to put things?
Are there assumptions about the options that I'm missing here?

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5902-WIP-Removing-monkeypatches-for-litegraph-logic-2816d73d3650818b860ec73579b89b54)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

src/services/colorPaletteService.ts

@@ -84,9 +84,6 @@ export const useColorPaletteService = () => {
    * @param liteGraphColorPalette - The palette to set.
    */
   const loadLiteGraphColorPalette = (palette: Colors['litegraph_base']) => {
-    // Sets special case colors
-    app.bypassBgColor = palette.NODE_BYPASS_BGCOLOR
-
     // Sets the colors of the LiteGraph objects
     app.canvas.node_title_color = palette.NODE_TITLE_COLOR
     app.canvas.default_link_color = palette.LINK_COLOR