Address review: validate settings type and preserve exception details

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: MuyuanMS

src/common/SettingsAPI/settings_objects.h

@@ -78,7 +78,7 @@ namespace PowerToysSettings
         {
             json::JsonObject prop_value;
             prop_value.SetNamedValue(L"value", json::value(value));
-            if (!m_json.HasKey(L"properties"))
+            if (!json::has(m_json, L"properties", json::JsonValueType::Object))
             {
                 m_json.SetNamedValue(L"properties", json::JsonObject{});
             }

src/modules/LightSwitch/LightSwitchService/LightSwitchStateManager.cpp

@@ -143,9 +143,17 @@ static std::pair<int, int> update_sun_times(auto& settings)
 
         Logger::info(L"[LightSwitchService] Updated sun times and saved to config.");
     }
+    catch (const winrt::hresult_error& e)
+    {
+        Logger::error(L"[LightSwitchService] Exception during sun time update: hresult_error 0x{:08X} - {}", e.code(), e.message().c_str());
+    }
+    catch (const std::exception& e)
+    {
+        Logger::error(L"[LightSwitchService] Exception during sun time update: std::exception - {}", winrt::to_hstring(e.what()).c_str());
+    }
     catch (...)
     {
-        Logger::error(L"[LightSwitchService] Exception during sun time update.");
+        Logger::error(L"[LightSwitchService] Exception during sun time update: unknown exception");
     }
 
     return { newLightTime, newDarkTime };