feat(layout): 重构布局并添加新功能

- 重新调整了全局样式，增加了重置样式和容器样式优化
- 设计并实现了新的悬浮迷你菜单
- 更新了主内容区的样式，使其扩展到全视窗
- 在首页添加了背景切换功能和新的标题样式
- 优化了操作指南的布局和样式

src/app/sidebar.module.css

@@ -0,0 +1,57 @@
+.miniSidebar {
+  position: fixed;
+  left: 16px;
+  top: 50%;
+  transform: translateY(-50%);
+  width: 4rem;
+  height: max-content;
+  max-height: 80vh;
+  background-color: rgba(249, 250, 251, 0.95);
+  border-radius: 1rem;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 1rem 0;
+  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+  backdrop-filter: blur(8px);
+  z-index: 50;
+}
+
+.miniSidebarItem {
+  width: 3rem;
+  height: 3rem;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 0.75rem;
+  margin: 0.5rem 0;
+  transition: all 0.2s ease;
+  position: relative;
+  cursor: pointer;
+}
+
+.miniSidebarItem:hover {
+  background-color: rgba(209, 213, 219, 0.5);
+}
+
+.tooltip {
+  position: absolute;
+  left: 4rem;
+  top: 50%;
+  transform: translateY(-50%);
+  background-color: #1f2937;
+  color: #f9fafb;
+  padding: 0.5rem 1rem;
+  border-radius: 0.5rem;
+  white-space: nowrap;
+  opacity: 0;
+  visibility: hidden;
+  transition: all 0.2s ease;
+  font-size: 0.875rem;
+}
+
+.miniSidebarItem:hover .tooltip {
+  opacity: 1;
+  visibility: visible;
+  pointer-events: auto;
+}