Route desktop codec diagnostics through the shared log

Quiet capability probes, preserve runtime errors, and register the desktop portal application. Add logging and desktop launcher regression coverage.

tools/chatgui/tests/test_desktop_integration.cpp

@@ -0,0 +1,44 @@
+// Настоящий desktop parser/launcher: путь с пробелами, кавычками и спецсимволами сохраняется без shell-подстановок.
+#include <QtTest>
+#include <QDir>
+#include <QFile>
+#include <QProcess>
+#include <QStandardPaths>
+#include <QTemporaryDir>
+#include "../src/desktop_integration.h"
+#include "debug_config.h"
+
+class DesktopTest : public QObject {
+    Q_OBJECT
+private slots:
+    void registrationAndLaunch() {
+        QTemporaryDir directory; QVERIFY(directory.isValid());
+        qputenv("XDG_DATA_HOME", directory.path().toUtf8());
+        qputenv("XDG_DATA_DIRS", directory.filePath("system-data").toUtf8());
+        const QString executable = directory.filePath("space quote\" dollar$ backtick` percent% slash\\-тест");
+        QFile script(executable); QVERIFY(script.open(QIODevice::WriteOnly));
+        script.write("#!/bin/sh\nprintf '%s' \"$0\" > \"$DESKTOP_RESULT\"\n"); script.close();
+        QVERIFY(script.setPermissions(QFile::ReadOwner | QFile::WriteOwner | QFile::ExeOwner));
+        QVERIFY(registerDesktopApplication(executable));
+        const QString path = directory.filePath("applications/org.utun.vibechat.desktop");
+        QFile file(path); QVERIFY(file.open(QIODevice::ReadOnly)); const auto original = file.readAll(); file.close();
+        QVERIFY(registerDesktopApplication("/must/not/replace/existing/entry"));
+        QVERIFY(file.open(QIODevice::ReadOnly)); QCOMPARE(file.readAll(), original); file.close();
+        const auto gio = QStandardPaths::findExecutable("gio");
+        if (gio.isEmpty()) QSKIP("gio unavailable: desktop entry created; launcher validation needs GLib tools");
+        const QString output = directory.filePath("result"); qputenv("DESKTOP_RESULT", output.toUtf8());
+        QProcess process; process.start(gio, {"launch", path}); QVERIFY(process.waitForFinished(5000));
+        QCOMPARE(process.exitStatus(), QProcess::NormalExit);
+        QVERIFY2(process.exitCode() == 0, (process.readAllStandardError() + "\nentry:\n" + original).constData());
+        QFile result(output); QTRY_VERIFY(result.exists()); QVERIFY(result.open(QIODevice::ReadOnly));
+        QCOMPARE(QString::fromUtf8(result.readAll()), executable);
+    }
+    void registrationFailure() {
+        QTemporaryDir directory; QVERIFY(directory.isValid());
+        qputenv("XDG_DATA_HOME", directory.path().toUtf8());
+        QFile obstacle(directory.filePath("applications")); QVERIFY(obstacle.open(QIODevice::WriteOnly)); obstacle.close();
+        QVERIFY(!registerDesktopApplication("/example/vibechat"));
+    }
+};
+QTEST_GUILESS_MAIN(DesktopTest)
+#include "test_desktop_integration.moc"