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_main_window.py

@@ -20,3 +20,22 @@ def test_main_window_opens(qtbot) -> None:  # type: ignore[no-untyped-def]
     window.show()
     assert window.isVisible()
     assert window.windowTitle() == "OTKO"
+
+
+@pytest.mark.gui
+def test_close_dirty_hidden_window_does_not_block(qtbot) -> None:  # type: ignore[no-untyped-def]
+    """Closing a dirty but hidden window must not raise a modal prompt.
+
+    Qt closes hidden widgets during teardown (as ``pytest-qt`` does); a
+    modal "unsaved changes" dialog there would block forever with no user
+    to answer it. The prompt is therefore gated on visibility.
+    """
+    from otko.views.main_window import MainWindow
+
+    window = MainWindow()
+    qtbot.addWidget(window)
+    window._vm.new_project()
+    window._vm.mark_dirty()
+    assert not window.isVisible()
+    assert window.close() is True
+    assert window._vm.is_dirty  # unchanged: the prompt was skipped