refactor: redesign web UX with progressive disclosure and cleaned layout

internal/webapp/assets_test.go

@@ -16,7 +16,7 @@ func TestHandlerServesIndex(t *testing.T) {
 	if rec.Code != http.StatusOK {
 		t.Fatalf("status = %d", rec.Code)
 	}
-	if !strings.Contains(rec.Body.String(), "Interview practice") {
+	if !strings.Contains(rec.Body.String(), "Turn answers into evidence") {
 		t.Fatal("expected app shell content")
 	}
 }