fix(alert): vertically center alert content

Add align-items: center to .alert flex container and remove bottom
margin from .alert-title that was offsetting the text.

src/ui/alert.css

@@ -1,6 +1,7 @@
 .alert {
   position: relative;
   display: flex;
+  align-items: center;
   gap: var(--size-3);
   padding: var(--size-4) var(--size-6);
   background: var(--bg-1);
@@ -11,7 +12,7 @@
 
 .alert-title {
   font-weight: 600;
-  margin: 0 0 var(--size-1) 0;
+  margin: 0;
 }
 
 .alert-body {