refactor: update test command in package.json, add Lato-Regular font and grayscale note block image to thumbnail assets, and clean up utils.spec.ts by removing mock canvasFactory

Author: tomast1337

package.json

@@ -50,7 +50,7 @@
     "lint:sounds": "cd ./packages/sounds && bun run lint",
     "lint:thumbnail": "cd ./packages/thumbnail && bun run lint",
     "lint:components": "cd ./packages/components && bun run lint",
-    "test": "bun test **/*.spec.ts --coverage",
+    "test": "cd ./apps/backend && bun test",
     "cy:open": "bun run test:cy",
     "test:cy": "cd ./tests && bun run cy:open",
     "prettier": "prettier --write .",

packages/thumbnail/assets/fonts/Lato-Regular.ttf

@@ -1,20 +1,5 @@
 import { getKeyText, instrumentColors, isDarkColor } from './utils';
 
-// Mock canvasFactory
-jest.mock('./canvasFactory', () => ({
-  createCanvas: jest.fn().mockImplementation((width, height) => ({
-    width,
-    height,
-    getContext: jest.fn().mockReturnValue({
-      fillStyle: '',
-      fillRect: jest.fn(),
-      globalCompositeOperation: '',
-      globalAlpha: 0,
-      drawImage: jest.fn(),
-    }),
-  })),
-}));
-
 describe('instrumentColors', () => {
   it('should contain 16 color codes', () => {
     expect(instrumentColors).toHaveLength(16);