feat(theme): token semantik Catppuccin (Mocha/Latte/terminal) + mode auto via tea.BackgroundColorMsg + tombol T

e2e/e2e_test.go

@@ -275,6 +275,19 @@ func TestDoctorUsesConfigStacksDir(t *testing.T) {
 	}
 }
 
+func TestThemeCycle(t *testing.T) {
+	u := startTUI(t)
+	u.waitContains("beranda", 5*time.Second)
+	u.send("T") // auto → dark, toast memberi umpan balik visual
+	u.waitContains("Mode tema", 3*time.Second)
+	u.send("T") // dark → light
+	u.send("T") // light → terminal
+	u.send("q")
+	if code := u.waitExit(5 * time.Second); code != 0 {
+		t.Fatalf("exit code %d, mau 0", code)
+	}
+}
+
 func TestEnglishLanguage(t *testing.T) {
 	u := startTUIEnv(t, "TIA_LANG=en")
 	u.waitContains("·  home", 5*time.Second)