Components sweep — 24 specs across 2 waves

Material.io parity programme (#049) Phase 4 wave 1 + wave 2: 24 component specs landed in `specs/components/`, covering buttons (7 variants), cards (elevated/filled/outlined), checkboxes, dialogs, radio buttons, switches, tabs (primary/secondary), text fields (filled/outlined), app bars, badges, banners, sheets (modal/standard × bottom/side), carousels, chips, pickers (date/time), dividers, lists, menus, navigation (bar/rail/drawer), progress indicators, search view, sliders, snackbars, and tooltips. Each follows the "Material agrupa = nós agrupamos" consolidation policy: button variants in one spec, not seven.