style(emcn): put tooltip text on the design scale (text-caption)

Replace the tooltip's ad-hoc `text-xs` + `leading-[18px]` with the semantic
`text-caption` (12px) font-size token so the text styling is fully on the design
scale and self-documenting, matching how the rest of the system is set up. The
color already used the global `--text-body` token. No visual change (still 12px
with a ~18px line height).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: andresdjasso

apps/sim/components/emcn/components/tooltip/floating-tooltip.tsx

@@ -239,7 +239,7 @@ export const FloatingTooltip = memo(function FloatingTooltip({
       role={role}
       aria-hidden={role ? undefined : 'true'}
       className={cn(
-        'pointer-events-none fixed top-0 left-0 z-[var(--z-tooltip)] w-fit max-w-[min(16rem,calc(100vw-2rem))] rounded-lg border border-[var(--border)] bg-[var(--bg)] px-2 py-1.5 text-[var(--text-body)] text-xs opacity-100 shadow-sm transition-[opacity,filter,transform] duration-150 ease-out',
+        'pointer-events-none fixed top-0 left-0 z-[var(--z-tooltip)] w-fit max-w-[min(16rem,calc(100vw-2rem))] rounded-lg border border-[var(--border)] bg-[var(--bg)] px-2 py-1.5 text-[var(--text-body)] text-caption opacity-100 shadow-sm transition-[opacity,filter,transform] duration-150 ease-out',
         'motion-reduce:transition-none',
         className
       )}
@@ -248,11 +248,7 @@ export const FloatingTooltip = memo(function FloatingTooltip({
         transformOrigin: state.alignX === 'left' ? '12px 12px' : 'calc(100% - 12px) 12px',
       }}
     >
-      {children ?? (
-        <span className='block whitespace-normal break-words text-left leading-[18px]'>
-          {label}
-        </span>
-      )}
+      {children ?? <span className='block whitespace-normal break-words text-left'>{label}</span>}
     </div>,
     document.body
   )