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;

src/lib/components/AboutDialog.svelte

@@ -0,0 +1,112 @@
+<script lang="ts">
+  import { getVersion } from '@tauri-apps/api/app';
+
+  let { onClose }: { onClose: () => void } = $props();
+
+  let version = $state('');
+
+  $effect(() => {
+    getVersion().then((v) => {
+      version = v;
+    });
+  });
+</script>
+
+<div class="overlay" role="presentation" onclick={onClose}>
+  <div class="dialog" role="dialog" onclick={(e) => e.stopPropagation()}>
+    <img class="app-icon" src="/favicon.svg" alt="GUI Video Clipper icon" />
+    <h2>GUI Video Clipper</h2>
+    {#if version}
+      <span class="version">v{version}</span>
+    {/if}
+    <p class="author">by cottongin</p>
+    <p class="license">MIT License</p>
+    <a
+      class="repo-link"
+      href="https://code.cottongin.xyz/cottongin/gui-video-clipper"
+      target="_blank"
+      rel="noopener noreferrer"
+    >
+      code.cottongin.xyz/cottongin/gui-video-clipper
+    </a>
+    <div class="actions">
+      <button class="primary" onclick={onClose}>Close</button>
+    </div>
+  </div>
+</div>
+
+<style>
+  .overlay {
+    position: fixed;
+    inset: 0;
+    background: rgba(0, 0, 0, 0.5);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    z-index: 900;
+  }
+
+  .dialog {
+    background: var(--bg-secondary);
+    border: 1px solid var(--border);
+    border-radius: 12px;
+    padding: 32px;
+    max-width: 360px;
+    width: 100%;
+    text-align: center;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    gap: 8px;
+  }
+
+  .app-icon {
+    width: 64px;
+    height: 64px;
+    border-radius: 12px;
+    margin-bottom: 8px;
+  }
+
+  h2 {
+    margin: 0;
+    font-size: 18px;
+  }
+
+  .version {
+    color: var(--text-secondary);
+    font-size: 14px;
+    font-family: var(--font-mono);
+  }
+
+  .author {
+    color: var(--text-secondary);
+    font-size: 13px;
+    margin: 0;
+  }
+
+  .license {
+    color: var(--text-muted);
+    font-size: 12px;
+    margin: 0;
+  }
+
+  .repo-link {
+    color: var(--accent);
+    font-size: 12px;
+    text-decoration: none;
+  }
+
+  .repo-link:hover {
+    text-decoration: underline;
+  }
+
+  .actions {
+    margin-top: 12px;
+  }
+
+  .primary {
+    background: var(--accent);
+    color: var(--bg-primary);
+    font-weight: 600;
+  }
+</style>

src/lib/components/StatusBar.svelte

@@ -1,6 +1,17 @@
 <script lang="ts">
+  import { getVersion } from '@tauri-apps/api/app';
   import { session, upgradePreview } from '$lib/stores/videoSession.svelte';
 
+  let { onOpenAbout }: { onOpenAbout?: () => void } = $props();
+
+  let appVersion = $state('');
+
+  $effect(() => {
+    getVersion().then((v) => {
+      appVersion = v;
+    });
+  });
+
   let previewPercent = $derived(Math.round(session.previewProgress * 100));
   let exportPercent = $derived(Math.round(session.exportProgress * 100));
 
@@ -42,6 +53,11 @@
   {:else}
     <span class="status-text">Ready</span>
   {/if}
+  {#if appVersion}
+    <button class="version-btn" onclick={() => onOpenAbout?.()} title="About GUI Video Clipper">
+      v{appVersion}
+    </button>
+  {/if}
 </div>
 
 <style>
@@ -91,4 +107,21 @@
     background: var(--accent, #89b4fa);
     color: var(--bg-primary, #1e1e2e);
   }
+
+  .version-btn {
+    margin-left: auto;
+    background: none;
+    border: none;
+    color: var(--text-muted);
+    font-size: 11px;
+    font-family: var(--font-mono);
+    padding: 2px 6px;
+    cursor: pointer;
+    border-radius: 3px;
+  }
+
+  .version-btn:hover {
+    background: var(--bg-secondary);
+    color: var(--text-secondary);
+  }
 </style>