[CrashReporting] Mock dialog, sentry skeleton and CI prerequisites

Mock: DlgCrashReport preview dialog (no account needed, redacted log
preview), CrashReportingMode Ask/Always/Never setting in DebugSettings,
--simulate-crash flag and Help-menu preview entry. Send writes a local
mock JSON only.

Vendor sentry-native 0.17.3 via FetchContent behind
WITH_CRASH_REPORTING (breakpad everywhere, backend none under
sanitizers) plus a CrashReporter facade with early init and post-loop
shutdown. DSN is a placeholder: empty CMake default with
COCKATRICE_SENTRY_DSN env override, so SDK init is skipped and mock
behavior is unchanged until a real DSN is configured.

CI prerequisites riding here so every layer below builds green:
libcurl dev plus CA bundles in the Linux images and CodeQL env, sentry
Qt integration off (its own find_package cannot see the macOS thin Qt
layout), and the StrFunc Using construction makensis requires.

Tests: ctest green, format clean, code plus UI gates PASS.

libcockatrice_settings/libcockatrice/settings/debug_settings.cpp

@@ -34,4 +34,4 @@ int DebugSettings::getLocalGamePlayerCount() const
 QString DebugSettings::getDeckPathForPlayer(const QString &playerName) const
 {
     return getValue(playerName, "localgame", "deck").toString();
-}
+}

libcockatrice_settings/libcockatrice/settings/debug_settings.h

@@ -18,7 +18,10 @@ class DebugSettings : public SettingsManager
     Q_OBJECT
     friend class SettingsCache;
 
+public:
     explicit DebugSettings(const QString &settingPath, QObject *parent = nullptr);
+
+private:
     DebugSettings(const DebugSettings & /*other*/);
 
 public:

libcockatrice_settings/libcockatrice/settings/personal_settings.cpp

@@ -51,3 +51,24 @@ void PersonalSettings::setSeenTips(const QList<int> &_seenTips)
     }
     setValue(QVariant::fromValue(storedTipList), "seenTips", "tipOfDay");
 }
+
+PersonalSettings::CrashReportingMode PersonalSettings::getCrashReportingMode() const
+{
+    const int raw = getValue("crashReportingMode", QString(), QString(), 0).toInt();
+    switch (raw) {
+        case 1:
+            return CrashReportingMode::AlwaysSend;
+        case 2:
+            return CrashReportingMode::NeverSend;
+        case 0:
+        default:
+            // Clamp corrupt ini values back to Ask; the QSettings key string is unchanged (no migration).
+            return CrashReportingMode::Ask;
+    }
+}
+
+void PersonalSettings::setCrashReportingMode(CrashReportingMode _crashReportingMode)
+{
+    setValue(static_cast<int>(_crashReportingMode), "crashReportingMode");
+    emit crashReportingModeChanged(_crashReportingMode);
+}

libcockatrice_settings/libcockatrice/settings/personal_settings.h

@@ -24,8 +24,19 @@ public:
     void setShowTipsOnStartup(bool _showTipsOnStartup);
     void setSeenTips(const QList<int> &_seenTips);
 
+    enum class CrashReportingMode
+    {
+        Ask = 0,
+        AlwaysSend = 1,
+        NeverSend = 2
+    };
+
+    [[nodiscard]] CrashReportingMode getCrashReportingMode() const;
+    void setCrashReportingMode(CrashReportingMode _crashReportingMode);
+
 signals:
     void langChanged();
+    void crashReportingModeChanged(CrashReportingMode mode);
 
 public:
     explicit PersonalSettings(const QString &settingPath, QObject *parent = nullptr);