feat(auth): expand shared PAM support for custom policies

- Add support for DMS and System managed factor policies
- Add validated dedicated security-key PAM / U2F Key sources
- Restore U2F OR/AND flows

Related: #2874
Port 1.5

core/internal/qmlchecks/lockscreen_input_test.go

@@ -23,3 +23,51 @@ func TestLockScreenPasswordFieldBypassesTextInputIME(t *testing.T) {
 		t.Fatalf("passwordField should handle physical key text manually instead of relying on a text input control")
 	}
 }
+
+func TestLockScreenAuthenticationCardOwnsFactorControls(t *testing.T) {
+	data, err := os.ReadFile("../../../quickshell/Modules/Settings/LockScreenTab.qml")
+	if err != nil {
+		t.Fatalf("read lock screen settings QML: %v", err)
+	}
+
+	content := string(data)
+	authCard := strings.Index(content, `title: I18n.tr("Lock Screen Authentication")`)
+	behaviorCard := strings.Index(content, `title: I18n.tr("Lock Screen behaviour")`)
+	fingerprintToggle := strings.Index(content, `settingKey: "enableFprint"`)
+	u2fToggle := strings.Index(content, `settingKey: "enableU2f"`)
+	u2fSource := strings.Index(content, `settingKey: "lockU2fPamPath"`)
+	if authCard < 0 || behaviorCard < 0 || fingerprintToggle < 0 || u2fToggle < 0 || u2fSource < 0 {
+		t.Fatalf("expected authentication card, factor toggles, and U2F source setting")
+	}
+	for name, position := range map[string]int{
+		"fingerprint toggle": fingerprintToggle,
+		"U2F toggle":         u2fToggle,
+		"U2F source":         u2fSource,
+	} {
+		if position < authCard || position > behaviorCard {
+			t.Fatalf("%s must remain in the authentication card", name)
+		}
+	}
+}
+
+func TestLockScreenPamSupportsManagedAndSystemPolicies(t *testing.T) {
+	data, err := os.ReadFile("../../../quickshell/Modules/Lock/Pam.qml")
+	if err != nil {
+		t.Fatalf("read lock screen PAM QML: %v", err)
+	}
+
+	content := string(data)
+	for _, required := range []string{
+		"SettingsData.lockPamExternallyManaged",
+		"SettingsData.lockU2fPamPath",
+		"customU2fPamActive",
+		"u2fSuppressedByPrimaryPam",
+	} {
+		if !strings.Contains(content, required) {
+			t.Fatalf("lock screen PAM must contain %q", required)
+		}
+	}
+	if strings.Contains(content, "runningFromNixStore || resolveUserPam.running") {
+		t.Fatalf("DMS-managed policy must generate the sanitized user PAM stack on Nix-store installs")
+	}
+}