feat: add About dialog with version, author, and license info

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

src/App.svelte

@@ -8,6 +8,7 @@
   import SetupWizard from '$lib/components/SetupWizard.svelte';
   import PreferencesPanel from '$lib/components/PreferencesPanel.svelte';
   import ExportDialog from '$lib/components/ExportDialog.svelte';
+  import AboutDialog from '$lib/components/AboutDialog.svelte';
   import ProcessingModal from '$lib/components/ProcessingModal.svelte';
   import { loadPreferences } from '$lib/stores/preferences.svelte';
   import { getSelectedClipId, removeClip } from '$lib/stores/clips.svelte';
@@ -18,6 +19,7 @@
   let showSetupWizard = $state(true);
   let showPreferences = $state(false);
   let showExportDialog = $state(false);
+  let showAboutDialog = $state(false);
   let shuttleRate = $state(1);
 
   let transportControls = $state<TransportControls | null>(null);
@@ -131,6 +133,12 @@
           showExportDialog = true;
         }
         break;
+      case '/':
+        if (e.metaKey) {
+          e.preventDefault();
+          showAboutDialog = true;
+        }
+        break;
       default:
         break;
     }
@@ -155,6 +163,10 @@
   <ExportDialog onClose={() => (showExportDialog = false)} />
 {/if}
 
+{#if showAboutDialog}
+  <AboutDialog onClose={() => (showAboutDialog = false)} />
+{/if}
+
 {#if session.processingStep !== 'idle' && session.processingStep !== 'done'}
   <ProcessingModal />
 {/if}
@@ -162,6 +174,7 @@
 <div class="app-shell">
   <header class="toolbar">
     <UrlInput />
+    <button class="about-btn" onclick={() => (showAboutDialog = true)} title="About">ℹ</button>
     <button class="prefs-btn" onclick={() => (showPreferences = true)} title="Preferences">⚙</button>
   </header>
 
@@ -185,7 +198,7 @@
     </div>
   </main>
 
-  <StatusBar />
+  <StatusBar onOpenAbout={() => (showAboutDialog = true)} />
 </div>
 
 <style>
@@ -243,6 +256,11 @@
     overflow: hidden;
   }
 
+  .about-btn {
+    font-size: 16px;
+    padding: 4px 8px;
+  }
+
   .prefs-btn {
     font-size: 18px;
     padding: 4px 8px;