phase4: templUI-based frontend with HTMX-powered conversion form

internal/ui/home_test.go

@@ -0,0 +1,20 @@
+package ui
+
+import (
+	"bytes"
+	"context"
+	"testing"
+)
+
+func TestHomeRenderSmoke(t *testing.T) {
+	t.Parallel()
+
+	var buf bytes.Buffer
+	if err := Home().Render(context.Background(), &buf); err != nil {
+		t.Fatalf("render home: %v", err)
+	}
+
+	if got := buf.Len(); got <= 500 {
+		t.Fatalf("rendered output too small: %d", got)
+	}
+}