refactor(ui-native): d3roNativePalette amber->main 개명 (WS-NATIVE)

- packages/ui-native theme.ts accent: amber->main, amberDim->dim, amberGlow->glow (값 보존)
- apps/mobile 20건 + apps/mobile-rn 18건 + ui-native 컴포넌트 9건 = 47 참조 치환
SKIP: Led/PhosphorText/Header color prop 'amber'(의미론적 컴포넌트 API, 별도 마이그레이션)
       green/greenGlow 키(amber계 범위外)
정책: docs/REFACTOR_POLICY.md DP1, 이식 인사이트 P7

packages/ui-native/src/components/Led.tsx

@@ -11,7 +11,7 @@ export interface LedProps {
 }
 
 const COLOR_MAP: Record<string, string> = {
-  amber: d3roNativePalette.accent.amber,
+  amber: d3roNativePalette.accent.main,
   green: d3roNativePalette.tag.green,
   red: d3roNativePalette.tag.red,
   orange: d3roNativePalette.tag.orange,
@@ -19,7 +19,7 @@ const COLOR_MAP: Record<string, string> = {
 }
 
 export function Led({ color = 'amber', on = true, size = 8 }: LedProps): React.ReactElement {
-  const c = COLOR_MAP[color] ?? d3roNativePalette.accent.amber
+  const c = COLOR_MAP[color] ?? d3roNativePalette.accent.main
   const style: ViewStyle = {
     width: size,
     height: size,