✨ Add ScrollArea and Scrollbar components for enhanced scroll functionality

src/components/ui/scroll-area/scroll-area-scrollbar.svelte

@@ -0,0 +1,44 @@
+<script lang="ts">
+  import { ScrollArea as ScrollAreaPrimitive } from "bits-ui";
+  import { cn, type WithoutChild } from "@/utils/cn";
+  import { useHasPrimaryTouch } from "@/hooks/use-has-primary-touch";
+
+  let {
+    ref = $bindable(null),
+    class: className,
+    orientation = "vertical",
+    children,
+    thumbClassName,
+    ...restProps
+  }: WithoutChild<ScrollAreaPrimitive.ScrollbarProps> & {
+    thumbClassName?: string;
+  } = $props();
+
+  const hasPrimaryTouch = useHasPrimaryTouch();
+</script>
+
+{#if !$hasPrimaryTouch}
+  <ScrollAreaPrimitive.Scrollbar
+    bind:ref
+    data-slot="scroll-area-scrollbar"
+    {orientation}
+    class={cn(
+      "flex touch-none p-px transition-[colors] duration-150 select-none hover:bg-neutral-200 data-[state=hidden]:animate-out data-[state=hidden]:fade-out-0 data-[state=visible]:animate-in data-[state=visible]:fade-in-0 dark:hover:bg-neutral-900",
+      orientation === "vertical" &&
+        "h-full w-2.5 border-l border-l-transparent",
+      orientation === "horizontal" &&
+        "h-2.5 flex-col border-t border-t-transparent px-1 pr-1.25",
+      className,
+    )}
+    {...restProps}
+  >
+    {@render children?.()}
+    <ScrollAreaPrimitive.Thumb
+      data-slot="scroll-area-thumb"
+      class={cn(
+        "relative my-0.5 flex-1 rounded-full bg-neutral-300 transition-colors ease-out hover:bg-neutral-500/50 active:bg-neutral-500/75 dark:bg-neutral-800 dark:hover:bg-neutral-700 dark:active:bg-neutral-600",
+        thumbClassName,
+      )}
+    />
+  </ScrollAreaPrimitive.Scrollbar>
+{/if}