fix: 引入导航缓存机制，增强 UI 适配能力 (BUG-004)

sdk/app/services/wechat_adb_engine.py

@@ -123,6 +123,11 @@ class WeChatADBEngine:
             return ""
 
     def _find_text(self, text: str, xml: str = None) -> Optional[Tuple[int, int]]:
+        # 优先从导航缓存读取
+        from services.wechat_nav_cache import nav_cache
+        cached = nav_cache.get_page("current")
+        if cached and text in cached.get("elements", {}):
+            return cached["elements"][text].get("center")
         if xml is None:
             xml = self._get_xml()
         if not xml: