update minimap and canvas bg to use menu color tokens (#6589)

Update minimap and graph canvas menu (bottom right) to use menu tokens.
Change canvas BG color on default dark theme.

<img width="3840" height="2029" alt="image"
src="https://github.com/user-attachments/assets/6d168981-df27-40c0-829c-59150b8a6a12"
/>


┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6589-wip-Style-graph-canvas-color-2a26d73d365081cb88c4c4bdb2b6d3a5)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Alexander Brown <drjkl@comfy.org>

src/components/graph/modals/ZoomControlsModal.vue

@@ -4,7 +4,7 @@
     class="absolute right-0 bottom-[62px] z-1300 flex w-[250px] justify-center border-0! bg-inherit!"
   >
     <div
-      class="w-4/5 rounded-lg border border-node-border bg-interface-panel-surface p-2 text-text-primary shadow-lg select-none"
+      class="w-4/5 rounded-lg border border-interface-stroke bg-interface-panel-surface p-2 text-text-primary shadow-lg select-none"
       :style="filteredMinimapStyles"
       @click.stop
     >