feat(ui): toggle Server Timing HUD and link missing env badge

Add a local-only command palette action to show/hide the Server Timing
HUD via localStorage and a visibility event. Make the service heading
"Required variables missing" badge link to environment variables, with
tests covering both behaviors.

tests/Feature/Livewire/ConfigurationCheckerTest.php

@@ -111,6 +111,7 @@ it('warns when a service has missing required environment variables', function (
         ->assertSee('Required environment variable missing')
         ->assertSee('PLUNK_API_KEY')
         ->assertSee('Open environment variables');
+
 });
 
 it('marks the service environment variables menu when required values are missing', function () {