feat: enhanced 14 registry components + component gallery
Registry components enhanced with proper DreamStack patterns:
- Card: conditional title/subtitle/footer via when guards, slot for children
- Button: variant as string prop, disabled support
- Dialog: when-guarded overlay, slot for content, close button
- Progress: conditional label, variant support
- Input: conditional label, error state, helper text
- Alert: variant prop, slot for custom content
- Toggle: when-guarded label display
- Toast: when-guarded visibility
- Avatar: initials with variant
- Badge: label with variant prop
- Separator: optional centered label
New components:
- Stat: dashboard metric card (label, value, change delta)
- Tabs: tab switcher supporting 2-3 tabs
- Select: button-based option selector
New example:
- component-gallery.ds (89KB): imports 12 components, uses Card+Button,
Input+Alert, Progress, Badge+when/else, match expressions,
Stat metrics, Toggle, Avatar, Toast, Separator, every timer
All 10 examples pass. Browser-tested with zero errors.
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