AI made playwright tests + add them to the github.

Overlord-Server/src/paths.ts

@@ -1,12 +1,42 @@
 import path from "path";
 import { existsSync, mkdirSync } from "fs";
+import { tmpdir } from "os";
+
+function assertSafeTestDataDir(dir: string): void {
+  if (String(process.env.NODE_ENV || "").toLowerCase() !== "test") return;
+
+  if (process.env.OVERLORD_TEST_DATA_DIR !== "1") {
+    throw new Error(
+      "Refusing to run tests without OVERLORD_TEST_DATA_DIR=1. Use `bun test` so test/preload.ts can create an isolated data directory.",
+    );
+  }
+
+  const resolvedDir = path.resolve(dir);
+  const resolvedTemp = path.resolve(tmpdir());
+  const tempPrefix = `${resolvedTemp}${path.sep}`;
+  const normalize = (value: string) =>
+    process.platform === "win32" ? value.toLowerCase() : value;
+
+  if (!normalize(resolvedDir).startsWith(normalize(tempPrefix))) {
+    throw new Error(
+      `Refusing to use non-temporary DATA_DIR while NODE_ENV=test: ${resolvedDir}`,
+    );
+  }
+}
 
 export function resolveDataDir(): string {
   const envDir = process.env.DATA_DIR;
   if (envDir && envDir.trim()) {
+    assertSafeTestDataDir(envDir);
     return envDir;
   }
 
+  if (String(process.env.NODE_ENV || "").toLowerCase() === "test") {
+    throw new Error(
+      "Refusing to use the default application data directory while NODE_ENV=test. Run tests through `bun test`.",
+    );
+  }
+
   if (process.platform === "win32" && process.env.APPDATA) {
     return path.join(process.env.APPDATA, "Overlord");
   }
@@ -20,4 +50,4 @@ export function ensureDataDir(): string {
     mkdirSync(dir, { recursive: true });
   }
   return dir;
-}
+}