Initial commit: dial — interactive SSH host picker

A fast, read-only ~/.ssh/config picker that exec's the system ssh client.
Includes: static high-contrast picker with recency/frequency/name sort and
tag grouping, `dial keygen` (native ed25519/RSA + optional config entry), and
an optional offline YubiKey launch gate with one-time recovery codes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

internal/store/store_test.go

@@ -0,0 +1,82 @@
+package store
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// withHome points UserHomeDir at a temp dir for the duration of a test.
+func withHome(t *testing.T) string {
+	t.Helper()
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	// Ensure ~/.ssh exists as the store nests under it.
+	if err := os.MkdirAll(filepath.Join(home, ".ssh"), 0o700); err != nil {
+		t.Fatal(err)
+	}
+	return home
+}
+
+func TestSettingsRoundTrip(t *testing.T) {
+	withHome(t)
+	s := DefaultSettings()
+	s.YubiKeyEnabled = true
+	s.Sort = SortFrequent
+	if err := SaveSettings(s); err != nil {
+		t.Fatal(err)
+	}
+	got := LoadSettings()
+	if !got.YubiKeyEnabled || got.Sort != SortFrequent {
+		t.Errorf("round trip mismatch: %+v", got)
+	}
+}
+
+func TestLoadCorruptFallsBackToDefaults(t *testing.T) {
+	withHome(t)
+	d, _ := Dir()
+	// Simulate a mid-Syncthing partial write.
+	if err := os.WriteFile(filepath.Join(d, "settings.json"), []byte(`{"yubikey_enabled": tr`), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	got := LoadSettings()
+	def := DefaultSettings()
+	if got != def {
+		t.Errorf("corrupt settings should yield defaults, got %+v", got)
+	}
+}
+
+func TestRecordAndSort(t *testing.T) {
+	withHome(t)
+	if err := Record("web1"); err != nil {
+		t.Fatal(err)
+	}
+	if err := Record("web1"); err != nil {
+		t.Fatal(err)
+	}
+	if err := Record("db"); err != nil {
+		t.Fatal(err)
+	}
+	d := LoadData()
+	if d.Stats["web1"].Count != 2 {
+		t.Errorf("web1 count = %d, want 2", d.Stats["web1"].Count)
+	}
+	if d.Stats["db"].Count != 1 {
+		t.Errorf("db count = %d, want 1", d.Stats["db"].Count)
+	}
+}
+
+func TestToggleFavorite(t *testing.T) {
+	withHome(t)
+	on, err := ToggleFavorite("web1")
+	if err != nil || !on {
+		t.Fatalf("expected favorite on, got %v %v", on, err)
+	}
+	off, err := ToggleFavorite("web1")
+	if err != nil || off {
+		t.Fatalf("expected favorite off, got %v %v", off, err)
+	}
+	if len(LoadData().Favorites) != 0 {
+		t.Error("favorites should be empty after toggle off")
+	}
+}