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

apps/mobile/app/(tabs)/record.tsx

@@ -181,7 +181,7 @@ export default function RecordScreen(): React.ReactElement {
         )}
 
         {state === 'processing' && (
-          <ActivityIndicator size="large" color={d3roNativePalette.accent.amber} />
+          <ActivityIndicator size="large" color={d3roNativePalette.accent.main} />
         )}
 
         {transcript !== '' && state === 'done' && (
@@ -268,8 +268,8 @@ const styles = StyleSheet.create({
   },
   errorBox: {
     borderWidth: 1,
-    borderColor: d3roNativePalette.accent.amber,
-    backgroundColor: d3roNativePalette.accent.amberDim,
+    borderColor: d3roNativePalette.accent.main,
+    backgroundColor: d3roNativePalette.accent.dim,
     padding: 10,
     borderRadius: 6,
     width: '100%'