fix(web): app loads again after a chunk cycle blanked it at boot

apps/web/vite.config.ts

@@ -221,6 +221,30 @@ function devCompressionPlugin(): Plugin {
   };
 }
 
+// A static import cycle between chunks can run a chunk before the values it imports exist,
+// which blanks the app at boot. Fail the build instead of shipping it.
+function chunkCycleGuardPlugin(): Plugin {
+  return {
+    name: "t3code:chunk-cycle-guard",
+    apply: "build",
+    generateBundle(_options, bundle) {
+      const done = new Set<string>();
+      const visit = (fileName: string, path: string[]) => {
+        if (done.has(fileName)) return;
+        const start = path.indexOf(fileName);
+        if (start !== -1) {
+          this.error(`Chunk import cycle: ${[...path.slice(start), fileName].join(" -> ")}`);
+        }
+        const chunk = bundle[fileName];
+        if (chunk?.type !== "chunk") return;
+        for (const imported of chunk.imports) visit(imported, [...path, fileName]);
+        done.add(fileName);
+      };
+      for (const fileName of Object.keys(bundle)) visit(fileName, []);
+    },
+  };
+}
+
 // Allow Tailnet hosts for sharing; Tailscale-controlled DNS prevents attacker rebinding.
 const configuredAllowedHosts = (process.env.T3CODE_DEV_ALLOWED_HOSTS ?? "")
   .split(",")
@@ -242,6 +266,7 @@ export default defineConfig(() => {
     assetsInclude: ["**/*.wasm"],
     plugins: [
       devCompressionPlugin(),
+      chunkCycleGuardPlugin(),
       builtDev
         ? undefined
         : thirdPartyLicensesPlugin({
@@ -359,21 +384,6 @@ export default defineConfig(() => {
             asset.originalFileNames.some((path) => /[/\\]pdfjs-dist[/\\]wasm[/\\]/.test(path))
               ? `assets/pdfjs-${pdfjsPkg.version}/[name][extname]`
               : "assets/[name]-[hash][extname]",
-          codeSplitting: {
-            // Preview imports must not fold shared file icons back into main.
-            groups: [
-              {
-                name: "react",
-                test: /\/node_modules\/(?:react|react-dom|scheduler)\//,
-                includeDependenciesRecursively: false,
-              },
-              {
-                name: "icons",
-                test: /\/(?:components\/chat\/PierreEntryIcon\.tsx|pierre-icons\.ts|mediaPreview\.ts)$/,
-                includeDependenciesRecursively: false,
-              },
-            ],
-          },
         },
       },
     },