feat: add dependency manager and setup wizard

Co-authored-by: Cursor <cursoragent@cursor.com>

src/App.svelte

@@ -5,8 +5,15 @@
   import Timeline from '$lib/components/Timeline.svelte';
   import ClipList from '$lib/components/ClipList.svelte';
   import StatusBar from '$lib/components/StatusBar.svelte';
+  import SetupWizard from '$lib/components/SetupWizard.svelte';
+
+  let showSetupWizard = $state(true);
 </script>
 
+{#if showSetupWizard}
+  <SetupWizard onComplete={() => (showSetupWizard = false)} />
+{/if}
+
 <div class="app-shell">
   <header class="toolbar">
     <UrlInput />