chore: adopt remaining local development state

Catch-all for the intermixed residue of the unpushed otko-development
work ported into this tree: combinations/console-dock/quick-guide wiring
across commands, core, services, views and tests; repo-wide ruff-format
normalization; README/CONTRIBUTING updates; and the toolbar default
(both toolbars now open in the top area, quick guide text updated).

Splitting this further would require hunk-level surgery with low
confidence; the preceding commits in this branch isolate the
self-contained features.

tests/gui/test_tree_multi_select.py

@@ -16,6 +16,7 @@ from otko.core import Node  # noqa: E402
 def test_tree_is_in_extended_selection_mode(qtbot) -> None:  # type: ignore[no-untyped-def]
     """Default QTreeWidget is single-select; we need ExtendedSelection."""
     from otko.views.main_window import MainWindow
+
     mw = MainWindow()
     qtbot.addWidget(mw)
     assert mw._tree.selectionMode() == QTreeWidget.SelectionMode.ExtendedSelection
@@ -27,14 +28,17 @@ def test_tree_multi_select_syncs_canvas(qtbot) -> None:  # type: ignore[no-untyp
     selection with both ids — the precondition for the Zero-Length
     Section dialog (exactly 2 joints)."""
     from otko.views.main_window import MainWindow
+
     mw = MainWindow()
     qtbot.addWidget(mw)
     mw._vm.new_project(ndm=2, ndf=3)
-    mw._vm.project.nodes.extend([
-        Node(id=1, coords=(0, 0, 0)),
-        Node(id=2, coords=(0, 0, 0)),
-        Node(id=3, coords=(1, 0, 0)),
-    ])
+    mw._vm.project.nodes.extend(
+        [
+            Node(id=1, coords=(0, 0, 0)),
+            Node(id=2, coords=(0, 0, 0)),
+            Node(id=3, coords=(1, 0, 0)),
+        ]
+    )
     mw._refresh_tree(mw._vm.project)
 
     nodes_cat = mw._tree_categories["Nodes"]