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/OmarchyTheme.h

@@ -0,0 +1,51 @@
+#pragma once
+#include <QColor>
+#include <QFileSystemWatcher>
+#include <QObject>
+#include <QPalette>
+#include <QTimer>
+
+// Omarchy's colors.toml, read into the colours the chrome uses.
+struct OmarchyColors {
+    bool dark;
+    QColor accent;
+    QColor selection;
+    QColor muted;
+    QColor background;
+    QColor darkBackground;
+    QColor darkerBackground;
+    QColor lighterBackground;
+    QColor foreground;
+    QColor darkForeground;
+    QColor lightForeground;
+    QColor brightForeground;
+    QColor red;
+    // `orange` where the theme has it, else `yellow`.
+    QColor warning;
+
+    // Throws std::runtime_error naming the missing or malformed key.
+    static OmarchyColors parse(const QString &toml);
+    // The macOS look, for a desktop without Omarchy.
+    static OmarchyColors builtInDark();
+    QPalette palette() const;
+    friend bool operator==(const OmarchyColors &, const OmarchyColors &) = default;
+};
+
+// Applies the current theme to the application and follows switches.
+class OmarchyTheme : public QObject {
+    Q_OBJECT
+public:
+    static QString defaultDirectory();
+    explicit OmarchyTheme(const QString &directory = defaultDirectory(), QObject *parent = nullptr);
+
+    const OmarchyColors &colors() const { return m_colors; }
+    void apply();
+
+private:
+    void watch();
+
+    const QString m_directory;
+    OmarchyColors m_colors;
+    QFileSystemWatcher m_watcher;
+    QTimer m_settle;
+};