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-rn/src/screens/TalkScreen.tsx

@@ -164,7 +164,7 @@ const styles = StyleSheet.create({
   },
   userBubble: {
     alignSelf: 'flex-end',
-    backgroundColor: d3roNativePalette.accent.amberDim,
+    backgroundColor: d3roNativePalette.accent.dim,
     borderWidth: 1,
     borderColor: 'rgba(255, 92, 53, 0.3)',
     borderTopRightRadius: 4
@@ -204,7 +204,7 @@ const styles = StyleSheet.create({
     width: 32,
     height: 32,
     borderRadius: 16,
-    backgroundColor: d3roNativePalette.accent.amberDim,
+    backgroundColor: d3roNativePalette.accent.dim,
     borderWidth: 1,
     borderColor: 'rgba(255, 92, 53, 0.3)',
     justifyContent: 'center',
@@ -218,7 +218,7 @@ const styles = StyleSheet.create({
     borderBottomWidth: 8,
     borderLeftColor: 'transparent',
     borderRightColor: 'transparent',
-    borderBottomColor: d3roNativePalette.accent.amber
+    borderBottomColor: d3roNativePalette.accent.main
   },
   inputStatus: { paddingVertical: 4 }
 })