Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/lib/auth/laravel-encrypter.test.ts

@@ -1,10 +1,6 @@
 import { randomBytes } from "node:crypto";
 import { describe, expect, it } from "vitest";
-import {
-  LaravelEncrypter,
-  phpSerializeString,
-  phpUnserializeString,
-} from "./laravel-encrypter";
+import { LaravelEncrypter, phpSerializeString, phpUnserializeString } from "./laravel-encrypter";
 
 // Dynamically generated 32-byte key so no secret is hardcoded in source.
 const APP_KEY = `base64:${randomBytes(32).toString("base64")}`;