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/navigation/TabNavigator.tsx

@@ -60,7 +60,7 @@ export default function TabNavigator(): React.ReactElement {
           paddingBottom: 20,
           paddingTop: 8,
         },
-        tabBarActiveTintColor: d3roNativePalette.accent.amber,
+        tabBarActiveTintColor: d3roNativePalette.accent.main,
         tabBarInactiveTintColor: d3roNativePalette.text.muted,
         tabBarLabelStyle: {
           fontFamily: MONO,
@@ -132,10 +132,10 @@ const fabStyles = StyleSheet.create({
     width: 56,
     height: 56,
     borderRadius: 28,
-    backgroundColor: d3roNativePalette.accent.amber,
+    backgroundColor: d3roNativePalette.accent.main,
     justifyContent: 'center',
     alignItems: 'center',
-    shadowColor: d3roNativePalette.accent.amber,
+    shadowColor: d3roNativePalette.accent.main,
     shadowOffset: { width: 0, height: 0 },
     shadowOpacity: 0.4,
     shadowRadius: 10,