Lock admin role permissions on server and client

client/public/version.js

@@ -1,5 +1,5 @@
 // Maintainer-controlled web client version.
 // Format: YYYY.MM.DD Rn (example: 2026.02.20 R2)
-window.CHGRID_WEB_VERSION = "2026.02.27 R299";
+window.CHGRID_WEB_VERSION = "2026.02.27 R300";
 // Optional display timezone for timestamps. Falls back to America/Detroit if unset/invalid.
 window.CHGRID_TIME_ZONE = "America/Detroit";

client/src/main.ts

@@ -2825,6 +2825,11 @@ function handleAdminRolePermissionListModeInput(code: string, key: string): void
       audio.sfxUiBlip();
       return;
     }
+    if (role.name === 'admin') {
+      updateStatus('Admin role permissions are locked on.');
+      audio.sfxUiCancel();
+      return;
+    }
     const nextPermissions = new Set(role.permissions);
     if (nextPermissions.has(value)) {
       nextPermissions.delete(value);