fix: sanitize adminGroups on config load + final-review cleanups

src/data/config.test.ts

@@ -177,3 +177,29 @@ describe("guestMode config", () => {
     });
   });
 });
+
+describe("adminGroups normalization", () => {
+  function loadAdminGroups(raw: unknown) {
+    const dir = mkdtempSync(join(tmpdir(), "tsmb-cfg-"));
+    const p = join(dir, "config.json");
+    writeFileSync(p, JSON.stringify(raw));
+    try {
+      return loadConfig(p).adminGroups;
+    } finally {
+      rmSync(dir, { recursive: true, force: true });
+    }
+  }
+
+  it("defaults to [] when absent", () => {
+    expect(loadAdminGroups({})).toEqual([]);
+  });
+  it("keeps valid non-negative integers", () => {
+    expect(loadAdminGroups({ adminGroups: [6, 8] })).toEqual([6, 8]);
+  });
+  it("filters out negatives, non-integers and non-numbers", () => {
+    expect(loadAdminGroups({ adminGroups: [6, -1, 2.5, "8", null] })).toEqual([6]);
+  });
+  it("a non-array value falls back to the default [] (no crash)", () => {
+    expect(loadAdminGroups({ adminGroups: "6" })).toEqual([]);
+  });
+});