feat: consolidate shared UI and harden browser authority for release

webui/vite.config.ts

@@ -202,12 +202,26 @@ function govoplanInstalledModulesPlugin(): Plugin {
 }
 
 export default defineConfig({
+  // The conformance harness shares node_modules, but must never replace the
+  // live application's optimized dependencies while browser checks run.
+  cacheDir: join(webuiRoot, "node_modules/.vite/govoplan-app"),
   plugins: [govoplanInstalledModulesPlugin(), react()],
   optimizeDeps: {
     exclude: availableWebModuleSpecifiers(),
-    // Dataflow is discovered through the virtual module registry, so Vite's
-    // initial scan cannot see this CommonJS-backed transitive dependency.
-    include: ["@xyflow/react"]
+    // The virtual module registry and deferred editors hide these imports from
+    // Vite's initial scan. Prebundle their exact vendor entry points up front:
+    // discovering them on the first Campaign/editor visit would otherwise
+    // invalidate active module requests and force a full-page reload.
+    // Module packages remain excluded above, preserving optional/lazy routes.
+    include: [
+      "@xyflow/react",
+      "read-excel-file/browser",
+      "read-excel-file/universal",
+      "@tiptap/core",
+      "@tiptap/extension-image",
+      "@tiptap/react",
+      "@tiptap/starter-kit"
+    ]
   },
   build: {
     manifest: true,