feat(dashboard): add server metrics charts and polish UI feedback

tests/Unit/ScrollbarColorTest.php

@@ -0,0 +1,9 @@
+<?php
+
+it('uses coollabs purple for scrollbars in dark mode', function () {
+    $utilities = file_get_contents(dirname(__DIR__, 2).'/resources/css/utilities.css');
+
+    expect($utilities)
+        ->toContain('dark:scrollbar-thumb-coollabs-100')
+        ->not->toContain('dark:scrollbar-thumb-warning');
+});