[优化] 一些主题优化

app/src/main/res/values-zh-rCN/strings.xml

@@ -1386,4 +1386,5 @@
     <string name="show_swipe_animation">启用滑动时动画</string>
     <string name="click_image_way">点击图片行为</string>
     <string name="show_web_log">输出日志</string>
+    <string name="is_blur_progressive_enable">启用渐变模糊</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -1390,4 +1390,5 @@
     <string name="show_swipe_animation">启用滑动时动画</string>
     <string name="click_image_way">点击图片行为</string>
     <string name="show_web_log">输出日志</string>
+    <string name="is_blur_progressive_enable">启用渐变模糊</string>
 </resources>

app/src/main/res/xml/pref_config_theme.xml

@@ -116,6 +116,12 @@
             android:title="@string/is_blur_enable"
             app:iconSpaceReserved="false" />
 
+        <io.legado.app.lib.prefs.SwitchPreference
+            android:defaultValue="false"
+            android:key="enableProgressiveBlur"
+            android:title="@string/is_blur_progressive_enable"
+            app:iconSpaceReserved="false" />
+
     </io.legado.app.lib.prefs.PreferenceCategory>
 
     <io.legado.app.lib.prefs.PreferenceCategory