feat(ui):修改主题页面自定义主题排列

 import 'package:flutter/material.dart';
-import 'package:get/utils.dart';
 import 'package:doublefeel_flutter/l10n/l10n_extensions.dart';
 
 import '../models/watch_theme_models.dart';
@@ -51,28 +50,27 @@ class CustomThemeCard extends StatelessWidget {
           _CreateThemeButton(onTap: onCreateTap),
           customThemes.isEmpty
               ? SizedBox(height: 0)
-              : SizedBox(
-                  height: 112,
-                  child: ListView.separated(
-                      scrollDirection: Axis.vertical,
-                      padding: EdgeInsets.zero,
-                      itemBuilder: (context, index) {
-                        return _CustomThemeItem(
-                          item: customThemes[index],
-                          selected: customThemes[index].id != null &&
-                              customThemes[index].id == activeThemeId,
-                          onTap: onThemeTap == null
-                              ? null
-                              : () => onThemeTap!(customThemes[index]),
-                        );
-                      },
-                      separatorBuilder: (context, index) {
-                        return SizedBox(
-                          width: 20,
-                        );
-                      },
-                      itemCount: customThemes.length),
-                ).paddingOnly(top: 12),
+              : GridView.builder(
+                  shrinkWrap: true,
+                  padding: const EdgeInsets.only(top: 12),
+                  physics: const NeverScrollableScrollPhysics(),
+                  itemCount: customThemes.length,
+                  gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
+                    crossAxisCount: 3,
+                    crossAxisSpacing: 20,
+                    mainAxisSpacing: 20,
+                    mainAxisExtent: 114,
+                  ),
+                  itemBuilder: (context, index) {
+                    final theme = customThemes[index];
+                    return _CustomThemeItem(
+                      item: theme,
+                      selected: theme.id != null && theme.id == activeThemeId,
+                      onTap:
+                          onThemeTap == null ? null : () => onThemeTap!(theme),
+                    );
+                  },
+                ),
         ],
       ),
     );
@@ -152,34 +150,32 @@ class _CustomThemeItem extends StatelessWidget {
     return GestureDetector(
       behavior: HitTestBehavior.opaque,
       onTap: onTap,
-      child: SizedBox(
-        width: 88,
-        child: Column(
-          children: [
-            WatchThemeSelectedView(
-              selected: selected,
+      child: Column(
+        children: [
+          WatchThemeSelectedView(
+            selected: selected,
+            size: 88,
+            child: WatchThemeCharacterAvatar(
               size: 88,
-              child: WatchThemeCharacterAvatar(
-                size: 88,
-                assetPath: item.infoList.firstOrNull?.assetPath,
-                imageUrl: item.infoList.firstOrNull?.imgUrl,
-                empty: item.infoList.firstOrNull?.image == null,
-              ),
+              assetPath: item.infoList.firstOrNull?.assetPath,
+              imageUrl: item.infoList.firstOrNull?.imgUrl,
+              empty: item.infoList.firstOrNull?.image == null,
             ),
-            SizedBox(height: 8),
-            Text(
-              item.title,
-              maxLines: 1,
-              overflow: TextOverflow.ellipsis,
-              style: TextStyle(
-                color: WatchThemeColors.textPrimary,
-                fontSize: 12,
-                fontWeight: FontWeight.w400,
-                height: 1.25,
-              ),
+          ),
+          SizedBox(height: 8),
+          Text(
+            item.title,
+            textAlign: TextAlign.center,
+            maxLines: 1,
+            overflow: TextOverflow.ellipsis,
+            style: TextStyle(
+              color: WatchThemeColors.textPrimary,
+              fontSize: 12,
+              fontWeight: FontWeight.w400,
+              height: 1.25,
             ),
-          ],
-        ),
+          ),
+        ],
       ),
     );
   }