OmaPhoto 1.0.0: the Linux port of Compositor

A layered image editor for Linux and Omarchy, ported from Compositor
(github.com/robbietilton/Compositor), whose Swift source is its
specification. It reads and writes Compositor's .comp projects.

Packages for Ubuntu, Fedora and Arch come from the release workflow;
scripts/install/ holds one install script per distribution family,
and flake.nix serves NixOS.

Co-Authored-By: Claude <noreply@anthropic.com>

src/UI/FloatingPanel.h

@@ -0,0 +1,35 @@
+#pragma once
+#include <QPointer>
+#include <QString>
+#include <QWidget>
+#include <functional>
+
+class QDialog;
+
+// Swift's FloatingPanelController: a movable, non-modal tool panel.
+class FloatingPanel {
+public:
+    FloatingPanel(const QString &name, QWidget &owner);
+    ~FloatingPanel();
+    FloatingPanel(const FloatingPanel &) = delete;
+    FloatingPanel &operator=(const FloatingPanel &) = delete;
+    // New content and title; a shown panel keeps its place.
+    void show(const QString &title, QWidget *content);
+    // Hides the panel without reporting a close.
+    void close();
+    bool isVisible() const;
+    // Its close button and Escape report here, as Cancel.
+    std::function<void()> onClose;
+    // Hands the keys back to a shown panel, after clicks.
+    static void refocus(const QString &name);
+
+private:
+    friend class PanelWindow;
+    void remember();
+    void closed();
+
+    const QString m_name;
+    QWidget &m_owner;
+    QPointer<QDialog> m_panel;
+    QPointer<QWidget> m_content;
+};