feat(config): internal/config (load/save atomik + validasi) — wiring bahasa/suara/animasi + doctor baca config

e2e/e2e_test.go

@@ -58,7 +58,31 @@ type tui struct {
 	waited bool
 }
 
-func startTUI(t *testing.T) *tui { return startTUIEnv(t) }
+// startTUI memakai TIA_LANG=id eksplisit — deterministik walau mesin
+// pengembang/testing punya config.yaml sendiri.
+func startTUI(t *testing.T) *tui { return startTUIEnv(t, "TIA_LANG=id") }
+
+// envWith — gabung env proses + override tanpa duplikat key
+// (Linux getenv memakai kemunculan pertama, jadi duplikat berbahaya).
+func envWith(env []string) []string {
+	if len(env) == 0 {
+		return nil
+	}
+	overridden := map[string]bool{}
+	for _, kv := range env {
+		k, _, _ := strings.Cut(kv, "=")
+		overridden[k+"="] = true
+	}
+	out := make([]string, 0, len(os.Environ())+len(env))
+	for _, kv := range os.Environ() {
+		k, _, _ := strings.Cut(kv, "=")
+		if overridden[k+"="] {
+			continue
+		}
+		out = append(out, kv)
+	}
+	return append(out, env...)
+}
 
 func startTUIEnv(t *testing.T, env ...string) *tui {
 	t.Helper()
@@ -66,8 +90,8 @@ func startTUIEnv(t *testing.T, env ...string) *tui {
 		t.Skip("e2e pty tidak didukung di Windows")
 	}
 	cmd := exec.Command(binPath)
-	if len(env) > 0 {
-		cmd.Env = append(os.Environ(), env...)
+	if e := envWith(env); len(e) > 0 {
+		cmd.Env = e
 	}
 	ptmx, err := pty.StartWithSize(cmd, &pty.Winsize{Rows: rows, Cols: cols})
 	if err != nil {
@@ -216,6 +240,41 @@ func TestDoctorCommand(t *testing.T) {
 	}
 }
 
+func TestConfigFileRespected(t *testing.T) {
+	xdg := t.TempDir()
+	if err := os.MkdirAll(filepath.Join(xdg, "tia"), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(xdg, "tia", "config.yaml"),
+		[]byte("version: 1\nui:\n  language: en\n"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	u := startTUIEnv(t, "XDG_CONFIG_HOME="+xdg)
+	u.waitContains("·  home", 5*time.Second)
+	u.send("q")
+	if code := u.waitExit(5 * time.Second); code != 0 {
+		t.Fatalf("exit code %d, mau 0", code)
+	}
+}
+
+func TestDoctorUsesConfigStacksDir(t *testing.T) {
+	xdg := t.TempDir()
+	if err := os.MkdirAll(filepath.Join(xdg, "tia"), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	stacks := filepath.Join(xdg, "stacks-custom")
+	if err := os.WriteFile(filepath.Join(xdg, "tia", "config.yaml"),
+		[]byte("version: 1\nstacks_dir: "+stacks+"\n"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	cmd := exec.Command(binPath, "doctor")
+	cmd.Env = envWith([]string{"XDG_CONFIG_HOME=" + xdg})
+	out, _ := cmd.CombinedOutput()
+	if !strings.Contains(string(out), "stacks-custom") {
+		t.Fatalf("doctor tidak memakai stacks_dir dari config:\n%s", out)
+	}
+}
+
 func TestEnglishLanguage(t *testing.T) {
 	u := startTUIEnv(t, "TIA_LANG=en")
 	u.waitContains("·  home", 5*time.Second)