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/Document/EditorSession+Brush.h

@@ -0,0 +1,24 @@
+// Swift's EditorSession+Brush extension: a stroke from press to commit.
+public:
+    bool canPaint() const;
+    std::unique_ptr<BrushStroke> makeRasterEdit(const ImageLayer &layer, const BrushSettings &settings = BrushSettings()) const;
+    void beginBrush(QPointF point);
+    void continueBrush(QPointF point);
+    // Where a Shift-click's line starts; nil on another target.
+    std::optional<QPointF> shiftLineStart() const;
+    void cancelBrush();
+    // Mouse-up's own call; false while busy.
+    bool finishBrushImmediately();
+    void finishBrush();
+    void commitPaintSnapshot(const BrushStroke &stroke);
+    // Off the UI thread; `done` follows the step or refusal.
+    void commitRasterEdit(std::shared_ptr<const BrushStroke> stroke, const QString &name, std::function<void()> alsoApply = {},
+                          std::function<void()> done = {});
+    bool usesOpacityKeys() const;
+    // Digits set 10%…100%; two quick ones, an exact value.
+    void typeOpacityDigit(int digit, std::optional<double> time = std::nullopt);
+    void changeBrushHardness(bool increase);
+    void changeBrushSize(bool increase);
+
+private:
+    void finishRasterCommit();