adding test

app/ui/app_test.go

@@ -0,0 +1,44 @@
+//go:build windows || darwin
+
+package ui
+
+import (
+	"io/fs"
+	"strings"
+	"testing"
+)
+
+// TestEmbeddedAssets verifies that the correct UI assets are embedded.
+// This test will FAIL THE BUILD if wrong files are embedded.
+func TestEmbeddedAssets(t *testing.T) {
+	fsys, err := fs.Sub(appFS, "app/dist")
+	if err != nil {
+		t.Fatal("app/dist not found in embedded filesystem - UI not built")
+	}
+	
+	// Check index.html exists
+	data, err := fs.ReadFile(fsys, "index.html")
+	if err != nil {
+		t.Fatal("index.html not found - run 'go generate' first")
+	}
+	
+	html := string(data)
+	
+	// Check it's NOT the source version
+	if strings.Contains(html, "/src/main.tsx") {
+		t.Fatal("Wrong index.html embedded: has /src/main.tsx (dev paths). The UI was not built. Run 'npm run build' first.")
+	}
+	
+	// Check it IS the built version
+	if !strings.Contains(html, "/assets/index-") {
+		t.Fatal("Wrong index.html embedded: missing /assets/index-* (production paths). The UI was not built correctly.")
+	}
+	
+	// Check assets directory exists
+	if _, err := fsys.Open("assets"); err != nil {
+		t.Fatal("assets/ directory not found - UI build incomplete")
+	}
+	
+	t.Log("Embedded assets verified - UI built correctly")
+}
+