1.11.0

Added

• wWindowClassOf(context) returns a WindowSizeClass (compact, medium, expanded), so a shell chooses a bar or a rail by window width and not by platform. Wind maps iOS to isMobile (platform_service.dart), so an iPad reads as a phone by platform, and wIsTablet is only the md to lg band, which turns false again on a wide iPad or a desktop window; neither answers "does this window have room for a rail". The classes are cut at the theme's own md and lg screens (compact below md, medium up to below lg, expanded from lg), so a custom screens table moves them, and it reads the size aspect of MediaQuery through wScreenIs, so a keyboard inset does not rebuild the caller. A platform or device-idiom check was rejected: split view puts an iPad in a phone-sized window. wIsTablet and isMobile are unchanged. (#259) (lib/src/utils/wind_extensions.dart, test/utils/wind_extensions_test.dart, doc/utilities/responsive-helpers.md, example/lib/pages/utilities/responsive_helpers_basic.dart, skills/wind-ui/SKILL.md, skills/wind-ui/references/theme.md)

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