polish: unit labels in parentheses, export panel styling, remove unused gradient utilities

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

components/animate/KeyframeProperties.tsx

@@ -30,7 +30,7 @@ function SliderRow({ label, unit, value, min, max, step = 1, onChange }: SliderR
     <div className="grid grid-cols-[1fr_auto] gap-x-3 items-center">
       <div className="space-y-1">
         <Label className="text-[10px] text-muted-foreground">
-          {label}{unit && <span className="text-muted-foreground/50 ml-0.5">{unit}</span>}
+          {label}{unit && <span className="text-muted-foreground/50"> ({unit})</span>}
         </Label>
         <Slider
           min={min}