feat(minimap): add node execution status visualization (#9187)

## Summary

Added visual indicators (colored borders) to the MiniMap to display the
real-time execution status (running, executed, or error) of nodes.

## Changes

- **What**: Added visual feedback to the MiniMap to show node execution
states (green for running/executed, red for errors) by integrating with
`useExecutionStore` and updating the canvas renderer.

## Review Focus

Confirmed that relying on the array `.includes()` check for
`executingNodeIds` in the data sources avoids unnecessary `Set`
allocations during frequent redraws.

## Screenshots 

<img width="540" height="446" alt="14949d48035db5c64cceb11f7f7f94a3"
src="https://github.com/user-attachments/assets/cac53a80-9882-43fd-a725-7003fe3fd21a"
/>

<img width="562" height="464" alt="7e922f54dea2cea4e6b66202d2ad0dd3"
src="https://github.com/user-attachments/assets/e178b981-3af0-417f-8e21-a706f192fabf"
/>

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9187-feat-minimap-add-node-execution-status-visualization-3126d73d3650816eb7b3ca415cf6a8f1)
by [Unito](https://www.unito.io)

src/utils/__tests__/litegraphTestUtils.ts

@@ -276,6 +276,8 @@ export function createMockCanvas2DContext(
     fillStyle: '',
     strokeStyle: '',
     lineWidth: 1,
+    save: vi.fn(),
+    restore: vi.fn(),
     ...overrides
   }
   return partial as CanvasRenderingContext2D