Add sourcemap to webapp

Author: TBlueF

common/webapp/vite.config.js

@@ -17,7 +17,9 @@ export default defineConfig({
         __VUE_I18N_LEGACY_API__: false,
         __INTLIFY_PROD_DEVTOOLS__: false,
     },
-    build: {},
+    build: {
+        sourcemap: true
+    },
     server: {
         proxy: {
             '/settings.json': {