fix(home): 使用图片渲染搜索栏入口

lib/pages/home/widgets/home_grid_header.dart

@@ -143,7 +143,9 @@ class HomeGridHeader extends StatelessWidget {
           _headerAction(
             key: const Key('home-vip-entry'),
             frameKey: const Key('home-vip-icon-frame'),
-            icon: Icons.workspace_premium_outlined,
+            imageKey: const Key('home-vip-image'),
+            assetPath: 'assets/icon/crown.png',
+            fallbackIcon: Icons.workspace_premium_outlined,
             color: AppColors.homeCrownGold,
             tooltip: l10n.vipMembership,
             onTap: callbacks.onOpenVip,
@@ -152,7 +154,9 @@ class HomeGridHeader extends StatelessWidget {
           _headerAction(
             key: const Key('home-wallet-entry'),
             frameKey: const Key('home-wallet-icon-frame'),
-            icon: Icons.card_giftcard_rounded,
+            imageKey: const Key('home-wallet-image'),
+            assetPath: 'assets/icon/gift.png',
+            fallbackIcon: Icons.card_giftcard_rounded,
             color: AppColors.homeGiftPink,
             tooltip: l10n.wallet,
             onTap: callbacks.onOpenWallet,
@@ -166,7 +170,9 @@ class HomeGridHeader extends StatelessWidget {
   Widget _headerAction({
     required Key key,
     required Key frameKey,
-    required IconData icon,
+    required Key imageKey,
+    required String assetPath,
+    required IconData fallbackIcon,
     required Color color,
     required String tooltip,
     required VoidCallback onTap,
@@ -189,10 +195,17 @@ class HomeGridHeader extends StatelessWidget {
                     child: SizedBox.square(
                       key: frameKey,
                       dimension: AppDimens.homeActionIcon,
-                      child: Icon(
-                        icon,
-                        size: AppDimens.homeActionIcon,
-                        color: color,
+                      child: Image.asset(
+                        assetPath,
+                        key: imageKey,
+                        width: AppDimens.homeActionIcon,
+                        height: AppDimens.homeActionIcon,
+                        fit: BoxFit.contain,
+                        errorBuilder: (_, _, _) => Icon(
+                          fallbackIcon,
+                          size: AppDimens.homeActionIcon,
+                          color: color,
+                        ),
                       ),
                     ),
                   ),