Require explicit dates for daily generation

internal/app/app_test.go

@@ -2061,6 +2061,22 @@ func TestResolveGenerateMapsCommandToReportDefinition(t *testing.T) {
 	}
 }
 
+func TestResolveGenerateDailyRequiresDate(t *testing.T) {
+	cfg := config.Defaults()
+	cfg.WeatherAPI.Timezone = "America/Chicago"
+
+	_, err := ResolveGenerate(GenerateRequest{
+		Config: cfg,
+		Report: ReportDaily,
+	}, mustParse("2026-05-29T08:00:00-05:00"))
+	if err == nil {
+		t.Fatal("ResolveGenerate() error = nil, want required date error")
+	}
+	if !strings.Contains(err.Error(), "requires an explicit date") {
+		t.Fatalf("ResolveGenerate() error = %q, want required date context", err.Error())
+	}
+}
+
 func TestResolveGenerateUsesConfiguredReportModules(t *testing.T) {
 	path := filepath.Join(t.TempDir(), "config.yml")
 	if err := os.WriteFile(path, []byte(`