Add coverage report and basic vitest settings

Set tests folder and coverage settings, update run commands for tests

package.json

@@ -4,7 +4,8 @@
 	"main": "",
 	"scripts": {
 		"test": "vitest",
-		"coverage": "vitest run --coverage",
+		"test:run": "vitest run",
+		"test:coverage": "vitest run --coverage",
 		"utils-min-build": "node_modules/esbuild/bin/esbuild utils.min=src/utils.mjs --outdir=build/js/output/ --format=esm --bundle --charset=utf8 --tree-shaking=false --minify-whitespace --minify-syntax --sourcemap",
 		"utils-build": "node_modules/esbuild/bin/esbuild utils=src/utils.mjs --outdir=build/js/output/ --format=esm --bundle --charset=utf8 --tree-shaking=false",
 		"utils-build-all": "npm run utils-min-build && npm run utils-build",
@@ -17,6 +18,7 @@
 	"devDependencies": {
 		"@eslint/js": "^9.20.0",
 		"@types/jquery": "^3.5.32",
+		"@vitest/coverage-v8": "^3.0.8",
 		"esbuild": "^0.25.0",
 		"eslint": "^9.20.1",
 		"globals": "^15.15.0",