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/NavigationToolHeader.h

@@ -0,0 +1,26 @@
+#pragma once
+#include "Document/EditorSession.h"
+#include "UI/ToolHeaderStyle.h"
+#include <QLineEdit>
+
+// The Hand and Zoom tools' bar: Zoom's percentage field.
+class NavigationToolHeader : public ToolHeaderBar {
+    Q_OBJECT
+public:
+    explicit NavigationToolHeader(EditorSession &session, QWidget *parent = nullptr);
+
+protected:
+    bool eventFilter(QObject *watched, QEvent *event) override;
+
+private:
+    void synchronize();
+    void syncZoom();
+    void applyZoom();
+    void step(double percent);
+
+    EditorSession &m_session;
+    QLineEdit *const m_zoom;
+    QLabel *const m_unit;
+    // What the field showed before the user typed.
+    QString m_displayed;
+};