Add cancelable confirmations and message types to WebUI

[briemla]

OP#10514

Problem

In the WebUI, confirmations could not be canceled. NiceGuiUiFactory.info_box only showed a ui.notify and returned an info box whose canceled was always False. Loading an otconfig, loading an otflow over existing sections/flows and starting a new project therefore discarded the current sections, flows and videos without a way to cancel.

In addition:

• every message was shown as an error (type="negative"), including plain hints,
• minimal_info_box ("Create events...", "Apply offset...") showed nothing.

UiFactory.info_box is synchronous, but a NiceGUI dialog has to be awaited.

Solution

• UiFactory gets two new methods, async ask_for_confirmation(message, initial_position) -> bool and show_message(message, initial_position, message_type), plus the MessageType enum (ERROR, WARNING, INFO). Both methods are deliberately not abstract: other front-ends (OTCloud) implement UiFactory, and the repo rule is that it must not gain abstract methods. Their defaults fall back to info_box, so such front-ends behave as before.
• NiceGUI
  • ask_for_confirmation opens a modal ConfirmationDialog (based on BaseDialog) with OK/Cancel. BaseDialog gets an overridable apply_label(), and GeneralKeys.LABEL_OK is new in the ResourceManager.
  • show_message maps the type to the notification type: error → negative, warning → warning, info → info. info_box still shows an error.
  • minimal_info_box shows a persistent notification with a spinner. update_message changes its text and close dismisses it. Without a client (e.g. startup preload), it does nothing instead of raising.
• customtkinter: ask_for_confirmation uses the existing CtkInfoBox(show_cancel=True). show_message uses the default, i.e. the same CtkInfoBox as before, so the customtkinter GUI does not change.
• View model
  • _load_otconfig, _load_otflow and start_new_project await ask_for_confirmation and stop on cancel.
  • _load_otflow and start_new_project (including the ViewModel port) are now async. load_configuration already awaited them, and the customtkinter GUI calls it via asyncio.run. start_new_project currently has no UI caller.
  • Every message now passes its type at the call site: failures are errors, missing selections and preconditions are warnings, and a successful cut is info.
  • show_cancel is no longer used by info_box and was removed from its signature. CtkInfoBox keeps it.
• Acceptance helper: open_project_otconfig confirms the new dialog.

Tests

• New tests/unit/OTAnalytics/adapter_ui/test_dummy_viewmodel_confirmation.py, run against a mocked UiFactory:
  • Cancel prevents loading an otconfig, loading an otflow and resetting the project. OK carries each action out.
  • An otflow loads without asking when nothing is configured.
  • Message types are passed at the call sites.
• tests/unit/OTAnalytics/plugin_ui/nicegui_gui/test_ui_factory.py:
  • The confirmation dialog returns True on OK and False on Cancel (NiceGUI User).
  • Each message type maps to the right notification type.
  • minimal_info_box is visible, updates its text, can be closed and works without a client.
• New tests/unit/OTAnalytics/adapter_ui/test_ui_factory_defaults.py covers the backward-compatible defaults of the new UiFactory methods.
• Updated the existing view model tests for the info_box → show_message / ask_for_confirmation change.

Results:

• pytest tests/unit: 1671 passed, 6 skipped.
• pre-commit run --all-files: flake8, black, isort and mypy pass. Three hooks fail locally for reasons unrelated to this PR, and they fail the same way on main:
  • ShellCheck needs a .venv in the checkout.
  • The mypy dependency auto-updater rewrites the config.
  • "fix end of files" flags a test data file.
• Acceptance tests:
  • test_project_information.py and test_filters_navigation_buttons.py pass. They open a project through the new confirmation dialog.
  • test_sections_and_flows.py::test_create_sections_two_times and test_export_track_statistics.py time out locally after the project is opened. They fail the same way on main.

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