system: keep error dialogs open until dismissed

src/libs/dialog.h

@@ -70,6 +70,21 @@ int KYTY_SYSV_ABI MsgDialogProgressBarSetMsg(int target, const char* msg);
 
 namespace ErrorDialog {
 
+struct HostSnapshot {
+	uint64_t generation;
+	int32_t  error_code;
+};
+
+struct VisualState {
+	bool     active;
+	uint64_t revision;
+};
+
+bool        GetHostSnapshot(HostSnapshot* snapshot);
+VisualState GetVisualState() noexcept;
+void        SetVisibilityCallback(void (*callback)());
+bool        HostAccept(uint64_t generation);
+
 int KYTY_SYSV_ABI ErrorDialogInitialize();
 int KYTY_SYSV_ABI ErrorDialogOpen(const void* param);
 int KYTY_SYSV_ABI ErrorDialogClose();