fix(SearchBar): change component variant according to redesign

src/shared/ui/SearchBar/SearchBar.svelte

@@ -20,8 +20,8 @@ let {
 }: Props = $props();
 </script>
 
-<Input bind:value {...rest}>
-    {#snippet leftIcon(size)}
+<Input bind:value variant="underline" {...rest}>
+    {#snippet rightIcon(size)}
         <SearchIcon size={inputIconSize[size]} />
     {/snippet}
 </Input>