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)/_layout.tsx

@@ -43,7 +43,7 @@ export default function TabsLayout(): React.ReactElement {
           paddingBottom: 20,
           paddingTop: 8
         },
-        tabBarActiveTintColor: d3roNativePalette.accent.amber,
+        tabBarActiveTintColor: d3roNativePalette.accent.main,
         tabBarInactiveTintColor: d3roNativePalette.text.muted,
         tabBarLabelStyle: {
           fontFamily: MONO_FONT,
@@ -52,7 +52,7 @@ export default function TabsLayout(): React.ReactElement {
           letterSpacing: 0.5
         },
         headerStyle: { backgroundColor: d3roNativePalette.bg.app },
-        headerTintColor: d3roNativePalette.accent.amber,
+        headerTintColor: d3roNativePalette.accent.main,
         headerTitleStyle: { fontWeight: '300', letterSpacing: 1, fontFamily: MONO_FONT },
         headerShown: false
       }}
@@ -129,10 +129,10 @@ const styles = 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,