feat: add extensive test suite

package.json

@@ -16,7 +16,8 @@
     "up": "bun dr push && docker compose build && docker rollout app && docker compose up -d backup backend -t 0 && bun ngreload",
     "logs": "docker compose logs -fn50",
     "ngreload": "docker compose restart -t 0 nginx",
-    "test": "playwright test"
+    "test": "bun test",
+    "test:coverage": "bun test --coverage --coverage-reporter=text --coverage-reporter=lcov"
   },
   "dependencies": {
     "@bprogress/next": "^3.2.12",
@@ -98,7 +99,6 @@
   "devDependencies": {
     "@better-auth/cli": "^1.4.6",
     "@biomejs/biome": "2.3.13",
-    "@playwright/test": "^1.57.0",
     "@tailwindcss/postcss": "^4.1.17",
     "@types/node": "^20.19.26",
     "@types/react": "19.2.14",