allow admin to access slice pages for support purposes

frontend/src/routes/slice-middleware.ts

···
-import { publicClient } from "../config.ts";
+import { publicClient, ADMIN_DID } from "../config.ts";
 import { buildAtUri } from "../utils/at-uri.ts";
 import { getSlice } from "../lib/api.ts";
 import type { AuthenticatedUser } from "./middleware.ts";
···
   try {
     const slice = await getSlice(publicClient, sliceUri);
 
-    // User has access if they own the slice
+    // User has access if they own the slice or are an admin
     const hasAccess = context.currentUser.isAuthenticated &&
-      context.currentUser.sub === profileDid;
+      (context.currentUser.sub === profileDid || context.currentUser.sub === ADMIN_DID);
 
     return {
       ...context,