Implement upsert label flow and use-based mark gone handling

vite.config.js

@@ -1,6 +1,10 @@
 import { defineConfig } from 'vite';
+import packageJson from './package.json';
 
 export default defineConfig({
+  define: {
+    __APP_VERSION__: JSON.stringify(packageJson.version),
+  },
   server: {
     port: 4173,
   },