feat: 新增隐私模式、全面的交易管理、预算与储蓄罐功能，并优化了整体用户界面和页面结构。

src/components/common/Layout/Layout.css

@@ -171,6 +171,29 @@
   transform: translateY(0) scale(0.95);
 }
 
+.notification-btn {
+  position: relative;
+}
+
+.notification-badge {
+  position: absolute;
+  top: -2px;
+  right: -2px;
+  background: #ef4444;
+  color: white;
+  font-size: 0.65rem;
+  font-weight: 700;
+  min-width: 16px;
+  height: 16px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 99px;
+  padding: 0 4px;
+  box-shadow: 0 2px 4px rgba(239, 68, 68, 0.4);
+  border: 1.5px solid var(--bg-primary);
+}
+
 /* Avatar Styles */
 .header-avatar-img {
   width: 38px;
@@ -257,6 +280,11 @@
     /* Prevent body scroll, force main to scroll */
   }
 
+  /* Zen Mode Overrides */
+  .app-layout.zen-mode .app-body {
+    height: 100vh;
+  }
+
   .app-main {
     flex: 1;
     padding: var(--spacing-lg);
@@ -296,4 +324,41 @@
   .app-header {
     transition: none;
   }
+}
+
+/* Zen Mode Specific Styles */
+.app-layout.zen-mode .app-main {
+  max-width: 900px;
+  margin: 0 auto;
+  padding-top: 4rem;
+  /* Give some breathing room */
+}
+
+.zen-exit-btn {
+  position: fixed;
+  top: 1rem;
+  right: 1.5rem;
+  z-index: 200;
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.5rem 1rem;
+  background: var(--glass-bg);
+  backdrop-filter: blur(16px);
+  -webkit-backdrop-filter: blur(16px);
+  border: 1px solid var(--glass-border);
+  border-radius: 99px;
+  color: var(--text-secondary);
+  font-size: 0.9rem;
+  font-weight: 500;
+  cursor: pointer;
+  transition: all 0.2s ease;
+  box-shadow: var(--glass-shadow);
+}
+
+.zen-exit-btn:hover {
+  background: var(--bg-elevated);
+  transform: translateY(-1px);
+  color: var(--text-primary);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
 }