refactor: use classic for conditional classes

apps/website/src/components/molecules/Location.svelte

@@ -6,6 +6,7 @@
     import { getContext } from 'svelte'
     import { spring } from 'svelte/motion'
     import dayjs from 'dayjs'
+    import { cx } from 'classix'
     import { lerp } from 'utils/math'
     import { PUBLIC_PREVIEW_COUNT } from '$env/static/public'
     import { seenLocations } from '$utils/stores'
@@ -110,7 +111,7 @@
         <div class="location__photos">
             {#each location.photos as { image }, index}
                 {#if image}
-                    {@const classes = ['location__photo', index === photoIndex ? 'is-visible' : null].join(' ').trim()}
+                    {@const classes = cx('location__photo', index === photoIndex && 'is-visible')}
                     <Image
                         class={classes}
                         id={image.id}

apps/website/src/components/molecules/PostCard.svelte

@@ -3,6 +3,7 @@
 </style>
 
 <script lang="ts">
+    import { cx } from 'classix'
     import Image from '$components/atoms/Image.svelte'
 
     export let street: string
@@ -13,11 +14,11 @@
     export let size: string = undefined
 
     const className = 'postcard'
-    $: classes = [
+    $: classes = cx(
         className,
         ...[size].map(variant => variant && `${className}--${variant}`),
         $$props.class
-    ].join(' ').trim()
+    )
 </script>
 
 <div class={classes}>

apps/website/src/components/molecules/ShopLocationSwitcher.svelte

@@ -5,6 +5,7 @@
 <script lang="ts">
     import { goto } from '$app/navigation'
     import { getContext, tick } from 'svelte'
+    import { cx } from 'classix'
     import { shopCurrentProductSlug } from '$utils/stores/shop'
     import { smoothScroll } from '$utils/stores'
 
@@ -12,11 +13,11 @@
 
     const { shopLocations }: any = getContext('shop')
 
-    const classes = [
+    const classes = cx(
         'shop-locationswitcher',
         isOver && 'is-over',
         $$props.class
-    ].join(' ').trim()
+    )
 
 
     // Quick location change