fix: add @electric-sql/pglite as dev dependency for test infrastructure

PGlite was imported in tests but only existed as an optional peer dep
of drizzle-orm, causing CI test failures.

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

package.json

@@ -18,6 +18,7 @@
 	},
 	"devDependencies": {
 		"@biomejs/biome": "^2.4.7",
+		"@electric-sql/pglite": "^0.4.3",
 		"@playwright/test": "^1.59.1",
 		"@tanstack/react-query-devtools": "^5.91.3",
 		"@tanstack/react-router-devtools": "^1.166.7",