feat: migrate shadcn/ui components to JSON wrapper definitions (Phase 8)

Implemented JSON wrappers for 29 key shadcn/ui components, enabling
JSON-based configuration for commonly-used library components. These
stay as TSX internally but are now JSON-compatible.

Components migrated:
- Button: ShadcnButton
- Badge: ShadcnBadge
- Card family: ShadcnCard, ShadcnCardHeader, ShadcnCardTitle, ShadcnCardContent
- Form inputs: ShadcnLabel, ShadcnInput, ShadcnTextarea, ShadcnCheckbox, ShadcnSwitch
- Separator: ShadcnSeparator
- ScrollArea: ShadcnScrollArea
- Tabs family: ShadcnTabs, ShadcnTabsList, ShadcnTabsTrigger, ShadcnTabsContent
- Dialog family: ShadcnDialog, ShadcnDialogContent, ShadcnDialogHeader, ShadcnDialogTitle
- Select family: ShadcnSelect, ShadcnSelectTrigger, ShadcnSelectContent, ShadcnSelectItem
- Slider: ShadcnSlider
- Tooltip family: ShadcnTooltip, ShadcnTooltipTrigger, ShadcnTooltipContent

Files created:
- 14 TypeScript interface files in src/lib/json-ui/interfaces/
- 29 JSON definition files in src/components/json-definitions/

Updated exports in:
- src/lib/json-ui/json-components.ts (29 new components)
- src/lib/json-ui/interfaces/index.ts (14 new interfaces)

Build: ✓ PASSED
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

audit-report.json

@@ -1,5 +1,5 @@
 {
-  "timestamp": "2026-01-21T03:37:31.595Z",
+  "timestamp": "2026-01-21T04:04:27.712Z",
   "issues": [],
   "stats": {
     "totalJsonFiles": 337,