fix(ui): simplify login and suppress pointer focus ring on locale select

frontend/src/index.css

@@ -267,6 +267,12 @@ body.thot-full-document { margin: 0; }
     color: oklch(var(--foreground));
     background: oklch(var(--card));
   }
+  /* Native selects can match :focus-visible after a pointer click as well.
+     Suppress only that outer ring; keyboard focus retains its visible outline. */
+  .thot-full-header .thot-shell-select[data-pointer-focus="true"]:focus {
+    outline: none;
+    box-shadow: none;
+  }
   .thot-shell-select {
     min-height: 2rem;
     max-width: 9rem;