update homepage styling and layout

apps/jingrow/frontend/src/views/HomePage.vue

@@ -707,7 +707,7 @@ onUnmounted(() => {
           </div>
         </div>
         <div class="footer-bottom">
-          <p class="copyright">© {{ currentYear }} {{ appName }}. 保留所有权利。</p>
+          <p class="copyright">© {{ currentYear }} {{ appName }}. 版权所有。</p>
         </div>
       </div>
     </footer>
@@ -719,7 +719,7 @@ onUnmounted(() => {
   min-height: 100vh; /* 使用 min-height 而不是固定 height */
   display: flex;
   flex-direction: column;
-  background: #f5f5f5;
+  background: white;
   position: relative;
   overflow: visible; /* 改为 visible 允许内容溢出 */
 }
@@ -806,7 +806,7 @@ onUnmounted(() => {
 .main-content {
   flex: 1;
   width: 100%;
-  padding: 24px;
+  padding: 24px 0;
   display: flex;
   flex-direction: column;
   overflow: hidden;
@@ -833,7 +833,6 @@ onUnmounted(() => {
 }
 
 .tool-page {
-  background: white;
   overflow: hidden;
   display: flex;
   flex-direction: column;
@@ -1149,6 +1148,8 @@ onUnmounted(() => {
   
   img {
     display: block;
+    min-width: 620px;
+    min-height: 620px;
     max-width: 100%;
     max-height: 100%;
     width: auto;