fix(svelte): let var -> props rune

Author: segunadebayo

packages/svelte/CHANGELOG.md

@@ -18,7 +18,9 @@ description: All notable changes will be documented in this file.
 
 ### Fixed
 
-- **Slider**: Fixed `Slider.ValueText` not displaying default value when no children provided
+- **Slider**:
+  - Fixed `Slider.ValueText` not displaying default value when no children provided
+  - Fixed `SliderThumbPropsProvider` to use modern Svelte 5 runes (`$props()` and `{@render children?.()}`)
 - **Combobox**:
   - Fixed focus stealing in controlled open mode
   - Removed problematic `aria-hidden` behavior to allow interaction with other page elements

packages/svelte/src/lib/components/slider/slider-thumb-props-provider.svelte

@@ -1,9 +1,18 @@
-<script lang="ts">
+<script module lang="ts">
+  import type { Snippet } from 'svelte'
   import type { ThumbProps } from '@zag-js/slider'
+
+  export interface SliderThumbPropsProviderProps {
+    value: ThumbProps
+    children?: Snippet
+  }
+</script>
+
+<script lang="ts">
   import { SliderThumbPropsProvider } from './use-slider-thumb-props-context'
 
-  export let value: ThumbProps
+  let { value, children }: SliderThumbPropsProviderProps = $props()
   SliderThumbPropsProvider(value)
 </script>
 
-<slot />
+{@render children?.()}