style(NodeSwitcher): use sm size for more compact appearance

- Change from md (36px/14px) to sm (28px/12px in default, 24px/11px in compact)
- Icon size 12px to match font size

web/src/components/business/NodeSwitcher.tsx

@@ -154,15 +154,15 @@ export function NodeSwitcher() {
         type="button"
         onClick={() => setOpen(!open)}
         className={cn(
-          'ui-control ui-select-trigger h-[var(--ui-height-md)] px-[var(--ui-px-md)] text-left text-[length:var(--ui-font-md)]',
+          'ui-control ui-select-trigger h-[var(--ui-height-sm)] px-[var(--ui-px-sm)] text-left text-[length:var(--ui-font-sm)]',
           open && 'ui-control-open',
           selected !== 'local' && 'border-amber-500/30 bg-amber-500/10 text-amber-600 hover:bg-amber-500/15 dark:text-amber-400',
         )}
       >
-        <MonitorDot size={14} className="shrink-0" />
+        <MonitorDot size={12} className="shrink-0" />
         <span className="min-w-0 flex-1 truncate">{currentLabel}</span>
         <ChevronDown
-          size={14}
+          size={12}
           strokeWidth={1.5}
           className={cn('shrink-0 text-[var(--text-muted)] transition-transform', open && 'rotate-180')}
         />