v2.2.0 — Assembly component port

New components

• Avatars — Size/shape variants, avatar groups
• Cards — Stat cards, info panels, activity feeds
• Checkboxes & Radios — Custom styled, color variants, check lists
• Dropdown — Toggleable overlay menus
• Tabs — ARIA-supported tab navigation, pills variant
• Timeline — Chronological event display
• Toasts — Dismissible notifications
• Loading — Skeleton shimmer placeholders

Improvements

• Reorganized component manual nav into grouped sections (Foundations, Content, Data display, Interactive)
• Split overloaded forms page into focused pages (buttons, progress, toggles)
• Moved scheme utility classes from tokens to utilities cascade layer
• Fixed checkbox text alignment using flex-based centering
• Fixed switch sizing and vertical text centering
• All components use --line tokens, CSS nesting, and data-* attributes