fix: scope bun test to tests/ directory to exclude Playwright files

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -10,7 +10,7 @@
 		"build": "vite build",
 		"db:generate": "bunx drizzle-kit generate",
 		"db:push": "bunx drizzle-kit push",
-		"test": "bun test",
+		"test": "bun test tests/",
 		"test:e2e": "bunx playwright test",
 		"test:e2e:ui": "bunx playwright test --ui",
 		"lint": "bunx @biomejs/biome check ."