feat: move svelte interface to 'src/interface'

src/interface/components/themes/BackgroundUploader.svelte

@@ -0,0 +1,26 @@
+<script lang="ts">
+  import { createEventDispatcher } from 'svelte';
+  
+  const dispatch = createEventDispatcher();
+  
+  function handleFileChange(event: Event) {
+    const input = event.target as HTMLInputElement;
+    const file = input.files?.[0];
+    if (file) {
+      dispatch('fileChange', file);
+    }
+  }
+</script>
+
+<div class="relative w-16 h-16 overflow-hidden transition rounded-xl bg-zinc-100 dark:bg-zinc-900">
+  <div class="flex items-center justify-center w-full h-full text-3xl font-bold text-gray-400 transition font-IconFamily hover:text-gray-500">
+    <!--  Plus icon -->
+    
+  </div>
+  <input
+    type="file"
+    accept="image/*, video/mp4"
+    on:change={handleFileChange}
+    class="absolute inset-0 w-full h-full opacity-0 cursor-pointer"
+  />
+</div>