feat: add version display, cache clearing on upgrade, exclude data dir

- Show app version (v0.4.0) in sidebar bottom
- Clear Electron web cache when version changes to prevent stale JS
- Exclude data/ directory from packaged app

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

electron-builder.yml

@@ -12,6 +12,7 @@ files:
   - "!scripts"
   - "!docs"
   - "!release"
+  - "!data"
 extraResources:
   - from: .next/standalone/
     to: standalone/

next.config.ts

@@ -1,8 +1,15 @@
 import type { NextConfig } from "next";
+import { createRequire } from "module";
+
+const require = createRequire(import.meta.url);
+const pkg = require("./package.json");
 
 const nextConfig: NextConfig = {
   output: 'standalone',
   serverExternalPackages: ['better-sqlite3'],
+  env: {
+    NEXT_PUBLIC_APP_VERSION: pkg.version,
+  },
 };
 
 export default nextConfig;

src/components/layout/ChatListPanel.tsx

@@ -282,6 +282,13 @@ export function ChatListPanel({ open }: ChatListPanelProps) {
           )}
         </div>
       </ScrollArea>
+
+      {/* Version */}
+      <div className="shrink-0 px-3 py-2 text-center">
+        <span className="text-[10px] text-muted-foreground/40">
+          v{process.env.NEXT_PUBLIC_APP_VERSION}
+        </span>
+      </div>
     </aside>
   );
 }