Honor env state dir in default UI paths

main.go

@@ -309,6 +309,9 @@ func (u *ui) filter() {
 
 func defaultStatePaths(stateDir string) statePaths {
 	baseDir := strings.TrimSpace(stateDir)
+	if baseDir == "" {
+		baseDir = strings.TrimSpace(os.Getenv("KEEPASSGO_STATE_DIR"))
+	}
 	if baseDir == "" {
 		configDir, err := os.UserConfigDir()
 		if err != nil || strings.TrimSpace(configDir) == "" {

main_test.go

@@ -1978,6 +1978,20 @@ func TestDefaultStatePathsUsesProvidedStateDir(t *testing.T) {
 	}
 }
 
+func TestDefaultStatePathsUsesEnvironmentStateDirWhenFlagUnset(t *testing.T) {
+	base := filepath.Join(t.TempDir(), "keepassgo-state-env")
+	t.Setenv("KEEPASSGO_STATE_DIR", base)
+
+	paths := defaultStatePaths("")
+
+	if got := paths.DefaultSaveAsPath; got != filepath.Join(base, "vault.kdbx") {
+		t.Fatalf("DefaultSaveAsPath = %q, want %q", got, filepath.Join(base, "vault.kdbx"))
+	}
+	if got := paths.RecentVaultsPath; got != filepath.Join(base, "recent-vaults.json") {
+		t.Fatalf("RecentVaultsPath = %q, want %q", got, filepath.Join(base, "recent-vaults.json"))
+	}
+}
+
 func TestResolveFlagOrEnvPrefersFlagThenEnvThenFallback(t *testing.T) {
 	t.Setenv("KEEPASSGO_TEST_VALUE", "from-env")