feat(ui): improve terminal mobile UX and server status feedback

Add keyboard-aware terminal controls, refine terminal layouts and navigation, surface proxy and Sentinel health warnings, and make avatar uploads update only after successful persistence.

tests/Feature/ModalScrollLockTest.php

@@ -0,0 +1,9 @@
+<?php
+
+test('confirmation modal closes before dispatching an event that can open another modal', function () {
+    $modal = file_get_contents(resource_path('views/components/modal-confirmation.blade.php'));
+
+    expect($modal)->toMatch(
+        '/if \(dispatchEvent\) \{\s*modalOpen = false;\s*\$nextTick\(\(\) => \$wire\.dispatch\(dispatchEventType, dispatchEventMessage\)\);/s'
+    );
+});