小调整，去掉部分冗余无用句

lib/pages/about_page.dart

@@ -21,8 +21,6 @@ class AboutPage extends StatelessWidget {
         ),
         backgroundColor: c.background,
         elevation: 0,
-        foregroundColor: c.textPrimary,
-        iconTheme: IconThemeData(color: c.textPrimary),
       ),
       body: Center(
         child: Padding(

lib/pages/battery_health_page.dart

@@ -707,9 +707,7 @@ class _BatteryHealthPageState extends State<BatteryHealthPage> {
         appBar: AppBar(
           // backgroundColor: Colors.white,
           elevation: 0,
-          scrolledUnderElevation: 0,
-          shadowColor: Colors.transparent,
-          surfaceTintColor: Colors.transparent,
+
           title: Text(
             '电池健康度',
             style: TextStyle(
@@ -852,19 +850,29 @@ class _BatteryHealthPageState extends State<BatteryHealthPage> {
                   ),
                 ],
               )
-            : const Center(
+            : Center(
                 child: Column(
                   mainAxisAlignment: MainAxisAlignment.center,
                   children: [
-                    Icon(Icons.battery_unknown, size: 64, color: Colors.grey),
-                    SizedBox(height: 16),
+                    Icon(
+                      Icons.battery_unknown,
+                      size: 64,
+                      color: context.colors.textTertiary,
+                    ),
+                    const SizedBox(height: 16),
                     Text(
                       '暂无数据',
-                      style: TextStyle(fontSize: 18, color: Colors.grey),
+                      style: TextStyle(
+                        fontSize: 18,
+                        color: context.colors.textTertiary,
+                      ),
                     ),
                     Text(
                       '点击右上角刷新尝试',
-                      style: TextStyle(fontSize: 14, color: Colors.grey),
+                      style: TextStyle(
+                        fontSize: 14,
+                        color: context.colors.textTertiary,
+                      ),
                     ),
                   ],
                 ),

lib/pages/changelog_page.dart

@@ -158,8 +158,7 @@ class _ChangelogPageState extends State<ChangelogPage>
           ),
         ),
         elevation: 0,
-        foregroundColor: c.textPrimary,
-        iconTheme: IconThemeData(color: c.textPrimary),
+
         bottom: PreferredSize(
           preferredSize: const Size.fromHeight(2.0),
           child: LinearProgressIndicator(