feat: expanded variant system — 30+ new CSS class mappings
variant_to_css expanded for all 14 components:
- Button: outline, toggle, toggle-on/off, tab-active/inactive, select
- Text: card-title/subtitle/footer, input-label/error/helper,
dialog-title, stat-*, separator-label, avatar-*
- Column: stat-card, dialog-panel/overlay, avatar, separator-*,
progress-fill-*, toast-*, alert-*
- Row: tabs, separator, select-group
- Input: input-default, input-error
variant_map_js expanded for dynamic variant resolution
New CSS:
- ds-btn-outline (transparent with indigo border)
- ds-tab / ds-tab-active (tab switcher styles)
- ds-tabs (flex container with subtle bg)
- ds-select-group (flex wrap)
- ds-separator-row / ds-separator-v
- ds-toast-success/error/warning/info colors
- ds-avatar-status
All 10 examples pass. Build sizes: gallery 93KB, dashboard 60KB.
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