Graph colours by depth, pan button and directory settings

Backend/Settings.py

@@ -48,6 +48,10 @@ DefaultSettings: dict[str, Any] = {
     # "Live": Markdown is edited where it's shown rendered (Obsidian-style
     # live preview). "Separate": rendered View and raw Edit are two modes.
     "MarkdownEditing": "Live",
+    # Graph view: directories as dots too (off: only files and the references
+    # between them), and the mouse button that pans ("Left", "Middle", "Right").
+    "GraphShowDirectories": True,
+    "GraphPanButton": "Middle",
 }
 
 DefaultThemesDirectory = ApplicationDirectory / "DefaultThemes"