macos: File > Open... and a welcome item in the Help menu

[dsrw]

Two macOS menu-bar changes.

Help > Enu Welcome — was "Launch Tutorial" opening tutorial-1; it opens the welcome level now, which is where a new player should start.

File > Open... — a new File menu, before Help, running the same native directory picker as Settings > Level > Open... and following the same rules for what a picked directory means (a dir with a level.json is a level: open its parent world at that level; anything else is a world, opened at its initial level). That resolution moved out of Settings.show_open_world into open_picked_dir so both entry points share one implementation.

⌘O works as you'd expect from a File menu. Godot 3.5's global menu API builds every item with keyEquivalent:@"" and has no way to attach one, so the shortcut is a normal input action instead: open_world ships with no events and only open_world.macosx binds ⌘O, so is_action_pressed stays valid on every platform but can only fire here. Being modal on the main thread, the picker releases the pointer first — otherwise the mouse stays captured by a game the player can't see behind the dialog.

Both are gated on connect_address_override == "", the same test the welcome item already used: a client joined to someone else's world can't open one of its own.

Testing

nim test passes. Driven against a running Enu on macOS:

• Menu bar reads Apple, Enu, File, Help; File contains Open..., Help contains Documentation, Web Site, ---, Enu Welcome.
• ⌘O (via the action) and clicking File > Open... each open the native dialog.
• Escape cancels with no level change; picking …/tutorial/welcome loads that level.

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