feat: 实现搜索结果的分类计数功能

添加搜索关键词时显示匹配结果数量的功能，同时优化了应用卡片和网格的UI样式

src/App.vue

@@ -303,6 +303,30 @@ const filteredApps = computed(() => {
 });
 
 const categoryCounts = computed(() => {
+  // 如果有搜索关键词，显示搜索结果数量
+  if (searchQuery.value.trim()) {
+    const q = searchQuery.value.toLowerCase().trim();
+    const counts: Record<string, number> = { all: 0 };
+
+    apps.value.forEach((app) => {
+      // 检查应用是否匹配搜索条件
+      const matches =
+        (app.name || "").toLowerCase().includes(q) ||
+        (app.pkgname || "").toLowerCase().includes(q) ||
+        (app.tags || "").toLowerCase().includes(q) ||
+        (app.more || "").toLowerCase().includes(q);
+
+      if (matches) {
+        counts.all++;
+        if (!counts[app.category]) counts[app.category] = 0;
+        counts[app.category]++;
+      }
+    });
+
+    return counts;
+  }
+
+  // 无搜索时显示总数量
   const counts: Record<string, number> = { all: apps.value.length };
   apps.value.forEach((app) => {
     if (!counts[app.category]) counts[app.category] = 0;