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/ToolHeaderStyle.h

@@ -0,0 +1,24 @@
+#pragma once
+#include <QFont>
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QWidget>
+
+// Shared metrics: switching tools never moves the canvas.
+namespace ToolHeaderStyle {
+inline constexpr int height = 42;
+QFont titleFont();
+QFont controlFont();
+}
+
+// A tool's bar: its title, then its controls' row.
+class ToolHeaderBar : public QWidget {
+    // findChild needs the meta-object; Qt 6.11 checks at compile time.
+    Q_OBJECT
+public:
+    explicit ToolHeaderBar(const QString &title, QWidget *parent = nullptr);
+
+    QLabel *const title;
+    // Controls go before the stretch that ends the row.
+    QHBoxLayout *const row;
+};