Way.Shell 2.1: notice, hidden Ways and the panel at the root

[jacalapa]

For an app made entirely of Ways, so its pages look like one app. Polyglot is the first: its own pages become Ways next to the CultureWay editor, in one panel at /.

Changes

• ShellOptions.Notice: a note above every Way, in the panel and on a Way's own page (e.g. "this is a public demo").
• WayModule.IsHidden: the panel does not list the Way in its menu, but it still opens at #/{id}/, e.g. an account page linked from the user's name (AccountUrl = "~/#/account/"). The panel opens the first visible Way.
• UseWayShell("/"): the panel as the app's home page. A convention narrows Reiho's catch-all route to / itself. Without it, every address the host does not map would get the panel's 404, or a redirect to sign-in when the panel requires authorization (an API client with a key would get 302 instead of 404). MapWay at the root is still refused.

The module contract stays at 2: existing modules and the @kododo-dev/way-shell 2.0 preset work unchanged.

Tests

• .NET: 53 on net8.0, net9.0 and net10.0 (new: notice and hidden in the settings, a hidden Way, the panel at the root with and without a path base, unknown addresses still 404).
• npm: typecheck, lint, 31 tests, build.
• Shell demo (now with a notice and a hidden "Account" Way) in Production: 40/40 in Chrome, Edge, Firefox and WebKit.
• Polyglot on a local 2.1.0 package: 119 tests, browser scenarios 33/33 in all four browsers.