refactor: v2-table-grouped/v2-pivot-grid/v2-card-display 일괄 폐기 (T5)

T3 (본체) + T4 (ConfigPanel) 흡수 완료에 따라 옛 별도 컴포넌트 폐기.
v2-split-panel-layout 은 별도 컨테이너로 유지 (Codex 권고).

폴더 5개 삭제
- v2-table-grouped/ (537 + ConfigPanel)
- v2-pivot-grid/ (1963 + utils + components + hooks + ConfigPanel)
- v2-card-display/ (1314 + ConfigPanel)
- pivot-grid/ (legacy)
- card-display/ (legacy)

ConfigPanel 3개 삭제
- V2TableGroupedConfigPanel.tsx
- V2PivotGridConfigPanel.tsx
- V2CardDisplayConfigPanel.tsx

레지스트리 / alias / hidden 정리
- lib/registry/components/index.ts: 5개 import 라인 제거 (renderer 자동 등록 폐기)
- ComponentsPanel.tsx: hidden 목록의 v2-card-display ("→ stats" 잘못된 매핑) /
  v2-table-grouped / v2-pivot-grid / pivot-grid / card-display 모두 제거
- DynamicComponentRenderer.tsx LEGACY_TO_UNIFIED: v2-card-display "→stats"
  (잘못) / v2-table-grouped / v2-pivot-grid / card-display alias 제거
- getComponentConfigPanel.tsx: 4개 dynamic import + alias 제거
- templateMigrate.ts: 3 매핑 제거
- componentConfig.ts: v2PivotGridOverridesSchema, v2CardDisplayOverridesSchema
  + 등록 + defaults 제거

이벤트 dead code
- types/component-events.ts: RefreshCardDisplayDetail / REFRESH_CARD_DISPLAY
  이벤트 (사용처 0건 — v2-card-display 전용) 제거

ScreenDesigner
- 4058 의 isCardDisplay 분기 (66.67% 그리드 특수 처리) 제거
- 4098 의 gridColumnsRatioMap 의 "card-display" 항목 제거

검증
- npx tsc --noEmit 우리 작업 파일 새 에러 0
- v2-table-grouped/v2-pivot-grid/v2-card-display/RefreshCardDisplay 잔존
  grep — 의도적 주석 5곳만 (폐기 흔적 설명)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/lib/utils/getComponentConfigPanel.tsx

@@ -63,8 +63,6 @@ const CONFIG_PANEL_MAP: Record<string, () => Promise<any>> = {
 
   // ========== 레이아웃/컨테이너 ==========
   "accordion-basic": () => import("@/lib/registry/components/accordion-basic/AccordionBasicConfigPanel"),
-  "card-display": () => import("@/lib/registry/components/card-display/CardDisplayConfigPanel"),
-  "v2-card-display": () => import("@/lib/registry/components/v2-card-display/CardDisplayConfigPanel"),
   "section-card": () => import("@/lib/registry/components/section-card/SectionCardConfigPanel"),
   "v2-section-card": () => import("@/lib/registry/components/v2-section-card/SectionCardConfigPanel"),
   "section-paper": () => import("@/lib/registry/components/section-paper/SectionPaperConfigPanel"),
@@ -79,8 +77,6 @@ const CONFIG_PANEL_MAP: Record<string, () => Promise<any>> = {
   // ========== 테이블/리스트 ==========
   "table-list": () => import("@/lib/registry/components/table-list/TableListConfigPanel"),
   "v2-table-list": () => import("@/components/v2/config-panels/InvDataConfigPanel"),
-  "pivot-grid": () => import("@/lib/registry/components/pivot-grid/PivotGridConfigPanel"),
-  "v2-pivot-grid": () => import("@/lib/registry/components/v2-pivot-grid/PivotGridConfigPanel"),
   "table-search-widget": () => import("@/lib/registry/components/table-search-widget/TableSearchWidgetConfigPanel"),
   "v2-table-search-widget": () => import("@/lib/registry/components/v2-table-search-widget/TableSearchWidgetConfigPanel"),
   "tax-invoice-list": () => import("@/lib/registry/components/tax-invoice-list/TaxInvoiceListConfigPanel"),
@@ -157,9 +153,8 @@ const CONFIG_PANEL_ALIAS: Record<string, string> = {
   "text-input": "input", "number-input": "input", "date-input": "input",
   "select-basic": "input", "checkbox-basic": "input", "textarea-basic": "input",
   "v2-aggregation-widget": "stats", "aggregation-widget": "stats",
-  "v2-status-count": "stats", "v2-card-display": "stats",
+  "v2-status-count": "stats",
   "v2-table-list": "table", "table-list": "table",
-  "v2-table-grouped": "table", "v2-pivot-grid": "table",
   "v2-tabs-widget": "container", "v2-section-card": "container",
   "v2-section-paper": "container", "v2-repeat-container": "container",
   "section-card": "container", "section-paper": "container",

frontend/lib/utils/templateMigrate.ts

@@ -50,12 +50,9 @@ const LEGACY_TO_UNIFIED: Record<string, string> = {
   'v2-aggregation-widget': 'stats',
   'aggregation-widget': 'stats',
   'v2-status-count': 'stats',
-  'v2-card-display': 'stats',
   'card-display': 'stats',
   'v2-table-list': 'table',
   'table-list': 'table',
-  'v2-table-grouped': 'table',
-  'v2-pivot-grid': 'table',
   'v2-tabs-widget': 'container',
   'v2-section-card': 'container',
   'v2-section-paper': 'container',