[App] Add onboarding wizard (#7064)

* [App] Add onboarding wizard

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* Adjust CI

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* Adjust CI again

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* Comments and fixes

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* Rebase.

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* Comments.

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* CI lol

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* CI again lol

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* Drop some settings, add some new ones.

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* Resize when expanding section

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Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/interface/widgets/onboarding/pages/account_setup_page.h

@@ -0,0 +1,38 @@
+#ifndef ACCOUNT_SETUP_PAGE_H
+#define ACCOUNT_SETUP_PAGE_H
+
+#include "../first_run_wizard_page.h"
+
+class QLabel;
+class QPushButton;
+
+/** @brief First-run account step. Does NOT embed DlgRegister's fields: they exist
+ *         to be handed to ConnectionController's network registration flow, which
+ *         this wizard has no visibility into. Reimplementing the fields here
+ *         without that wiring would look functional and silently do nothing --
+ *         worse than reuse. So: a friendly landing spot that opens the *existing*
+ *         DlgRegister / connect flow via signals FirstRunWizard forwards. */
+class AccountSetupPage : public FirstRunWizardPage
+{
+    Q_OBJECT
+
+public:
+    explicit AccountSetupPage(QWidget *parent = nullptr);
+
+    bool isSkippable() const override;
+    QString stepTitle() const override;
+    QString stepSubtitle() const override;
+    void retranslateUi() override;
+
+signals:
+    void registerRequested();
+    void connectRequested();
+
+private:
+    QLabel *bodyLabel;
+    QPushButton *registerButton;
+    QPushButton *connectButton;
+    QLabel *skipHintLabel;
+};
+
+#endif // ACCOUNT_SETUP_PAGE_H