Graph colours by depth, pan button and directory settings

Client/Core.py

@@ -167,6 +167,10 @@ class AppConfig:
     # text. "Live": rendered, and clicking a block shows its Markdown to edit
     # in place (like Obsidian's live preview). Only affects Markdown.
     MarkdownEditing: str = "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: bool = True
+    GraphPanButton: str = "Middle"
     # Double-click on a file: True opens it in SaraView's own viewer, False
     # hands it to the system's default program. The menu always offers the other.
     OpenFilesInApp: bool = True