Resolve linter issues, add unit tests, adjust test coverage

qr-web/package.json

@@ -3,11 +3,15 @@
     "version": "1.0.0",
     "private": true,
     "scripts": {
-        "dev": "next dev",
         "build": "next build",
+        "dev": "next dev",
+        "format": "prettier --write .",
+        "format:check": "prettier --check .",
+        "lint": "eslint .",
+        "lint:fix": "eslint . --fix",
         "start": "next start",
-        "lint": "next lint",
         "test": "vitest run",
+        "test:coverage": "vitest run --coverage",
         "test:watch": "vitest"
     },
     "dependencies": {
@@ -15,11 +19,11 @@
         "@tabler/icons-react": "^3.23.0",
         "@mantine/dropzone": "^7.14.0",
         "@mantine/hooks": "^7.14.0",
-        "next": "^15.0.3",
+        "next": "^16.1.6",
         "pdf-lib": "^1.4.2",
         "qr-code-styling": "^1.9.2",
-        "react": "^19.0.0",
-        "react-dom": "^19.0.0"
+        "react": "^19.2.4",
+        "react-dom": "^19.2.4"
     },
     "devDependencies": {
         "@testing-library/react": "^16.0.1",
@@ -29,7 +33,7 @@
         "@typescript-eslint/eslint-plugin": "^8.15.0",
         "@typescript-eslint/parser": "^8.15.0",
         "eslint": "^9.15.0",
-        "eslint-config-next": "^15.0.3",
+        "eslint-config-next": "^16.1.6",
         "eslint-config-prettier": "^9.1.0",
         "jsdom": "^25.0.0",
         "postcss": "^8.4.49",
@@ -37,6 +41,7 @@
         "postcss-preset-env": "^10.0.0",
         "typescript": "^5.6.3",
         "vitest": "^2.1.6",
+        "@vitest/coverage-v8": "^2.1.6",
         "@vitejs/plugin-react": "^4.3.4"
     },
     "engines": {