perf(ui): remove dead runtime controllers and unused stylesheet families
Two orphaned controllers in the reactive runtime targeted markup nothing emits any more: hydrateSidebarControllers looked for .wire-sidebar-shell and friends, which the Sidebar rewrite replaced with BEM classes earlier today, and hydrateDropdownControllers looked for [data-wrn-dropdown], which no component or compiler output has ever produced. ui.css loses the matching legacy sidebar rules, the wire-mega-menu family left behind when the MegaMenu scaffold was replaced, and a set of self-contained application-pattern families that nothing references. Utility layers are deliberately kept even where an individual member is not name-checked anywhere. wire-bg-primary is documented and tested while wire-bg-secondary is not, but they are one public family and splitting them would be incoherent. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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