fix(rtl): replace physical left/right CSS properties with logical equivalents

- border-l-[3px] → border-s-[3px] on .message-error-block (both CSS files)
- ml-auto → ms-auto on .message-step-time
- text-left → text-start on buttons and list items across panels and tool-call styles

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/ui/src/styles/panels/panel-shell.css

@@ -77,7 +77,7 @@
 }
 
 .panel-list-item-content {
-  @apply flex-1 text-left px-4 py-3 flex items-center justify-between gap-3 outline-none transition-colors w-full min-w-0;
+  @apply flex-1 text-start px-4 py-3 flex items-center justify-between gap-3 outline-none transition-colors w-full min-w-0;
 }
 
 .panel-list-item-content:hover {