diff --git a/static/src/app/lifecycle.ts b/static/src/app/lifecycle.ts
index 60f0818..a184012 100644
--- a/static/src/app/lifecycle.ts
+++ b/static/src/app/lifecycle.ts
@@ -41,6 +41,7 @@ export async function mounted() {
 
     // 立即加载初始数据（并行获取状态，优先同步运行模式）
     this.loadInitialData();
+    this.startConnectionHeartbeat();
 
     // 注册全局事件处理器（用于任务轮询）
     (window as any).__taskEventHandler = (event: any) => {
@@ -97,6 +98,7 @@ export function beforeUnmount() {
     this.resourceStopContainerStatsPolling();
     this.resourceStopProjectStoragePolling();
     this.resourceStopUsageQuotaPolling();
+    this.stopConnectionHeartbeat();
     teardownShowImageObserver();
     if (this.titleTypingTimer) {
         clearInterval(this.titleTypingTimer);
diff --git a/static/src/app/methods/ui.ts b/static/src/app/methods/ui.ts
index f78bb4f..4cae7d5 100644
--- a/static/src/app/methods/ui.ts
+++ b/static/src/app/methods/ui.ts
@@ -1163,6 +1163,50 @@ export const uiMethods = {
         this.socket = null;
     },
 
+    async checkConnectionHealth() {
+        const controller = typeof AbortController !== 'undefined' ? new AbortController() : null;
+        const timeoutId = controller ? window.setTimeout(() => controller.abort(), 5000) : null;
+        try {
+            const response = await fetch('/api/status', {
+                method: 'GET',
+                cache: 'no-store',
+                signal: controller?.signal
+            });
+            if (!response.ok) {
+                throw new Error(`HTTP ${response.status}`);
+            }
+            this.isConnected = true;
+            this.connectionHeartbeatFailCount = 0;
+        } catch (error) {
+            this.connectionHeartbeatFailCount = (this.connectionHeartbeatFailCount || 0) + 1;
+            // 一次失败就先置灰，避免“服务已断但常亮绿色”的误导
+            this.isConnected = false;
+        } finally {
+            if (timeoutId) {
+                clearTimeout(timeoutId);
+            }
+        }
+    },
+
+    startConnectionHeartbeat() {
+        if (this.connectionHeartbeatTimer) {
+            return;
+        }
+        this.connectionHeartbeatFailCount = 0;
+        // 先做一次即时探活，再进入定时轮询
+        this.checkConnectionHealth();
+        this.connectionHeartbeatTimer = window.setInterval(() => {
+            this.checkConnectionHealth();
+        }, this.connectionHeartbeatIntervalMs || 8000);
+    },
+
+    stopConnectionHeartbeat() {
+        if (this.connectionHeartbeatTimer) {
+            clearInterval(this.connectionHeartbeatTimer);
+            this.connectionHeartbeatTimer = null;
+        }
+    },
+
     openRealtimeTerminal() {
         const { protocol, hostname, port } = window.location;
         const target = `${protocol}//${hostname}${port ? ':' + port : ''}/terminal`;
diff --git a/static/src/app/state.ts b/static/src/app/state.ts
index 20b0e3f..8236f59 100644
--- a/static/src/app/state.ts
+++ b/static/src/app/state.ts
@@ -83,6 +83,9 @@ export function dataState() {
         conversationHasVideos: false,
         conversationListRequestSeq: 0,
         conversationListRefreshToken: 0,
+        connectionHeartbeatTimer: null,
+        connectionHeartbeatFailCount: 0,
+        connectionHeartbeatIntervalMs: 8000,
 
         // 工具控制菜单
         icons: ICONS,
diff --git a/static/src/styles/base/_global.scss b/static/src/styles/base/_global.scss
index 1b2705a..d65a342 100644
--- a/static/src/styles/base/_global.scss
+++ b/static/src/styles/base/_global.scss
@@ -18,6 +18,13 @@ body[data-theme='dark'] {
     color: var(--claude-text);
 }
 
+/* Remove iOS/Android WebView default tap highlight */
+html,
+body,
+* {
+    -webkit-tap-highlight-color: transparent;
+}
+
 /* Global icon utility */
 .icon {
     --icon-size: 1em;
diff --git a/static/src/styles/components/input/_composer.scss b/static/src/styles/components/input/_composer.scss
index 807d742..0a3cc8d 100644
--- a/static/src/styles/components/input/_composer.scss
+++ b/static/src/styles/components/input/_composer.scss
@@ -246,6 +246,9 @@
 .menu-entry {
     border: none;
     background: transparent;
+    -webkit-appearance: none;
+    appearance: none;
+    -webkit-tap-highlight-color: transparent;
     padding: 10px 12px;
     border-radius: 12px;
     font-size: 14px;
@@ -259,6 +262,11 @@
     min-height: 44px;
 }
 
+.menu-entry:focus,
+.menu-entry:focus-visible {
+    outline: none;
+}
+
 .menu-entry:hover:not(:disabled) {
     background: rgba(0, 0, 0, 0.05);
 }
diff --git a/static/src/styles/components/panels/_left-panel.scss b/static/src/styles/components/panels/_left-panel.scss
index 8545486..992a3d7 100644
--- a/static/src/styles/components/panels/_left-panel.scss
+++ b/static/src/styles/components/panels/_left-panel.scss
@@ -162,7 +162,7 @@
     width: 12px;
     height: 12px;
     border-radius: 6px;
-    background: var(--claude-muted);
+    background: #e34d4d;
     transition: background 0.2s ease, box-shadow 0.2s ease;
     position: relative;
     overflow: visible;
@@ -173,8 +173,8 @@
     position: absolute;
     inset: 0;
     border-radius: inherit;
-    opacity: 0;
-    background: transparent;
+    background: #e34d4d;
+    animation: statusPulse 2.4s ease-out infinite;
 }
 
 .connection-dot.active {
@@ -183,7 +183,6 @@
 
 .connection-dot.active::after {
     background: var(--claude-success);
-    animation: statusPulse 2.4s ease-out infinite;
 }
 
 .mode-icon-enter-active,
diff --git a/utils/conversation_manager.py b/utils/conversation_manager.py
index 21e80ee..b11143e 100644
--- a/utils/conversation_manager.py
+++ b/utils/conversation_manager.py
@@ -1064,6 +1064,17 @@ class ConversationManager:
         """
         try:
             index = self._load_index()
+            # 统计必须基于全量对话，避免启动阶段“仅预热最近20条索引”导致总数偏小。
+            # 这里按需触发一次全量重建；后续统计可复用已保存的完整索引。
+            try:
+                total_files = len(self._iter_conversation_files(sort_by_mtime=False))
+            except Exception:
+                total_files = 0
+            if total_files and len(index) < total_files:
+                rebuilt_full = self._rebuild_index_from_files(max_count=None)
+                if rebuilt_full:
+                    self._save_index(rebuilt_full)
+                    index = rebuilt_full
             
             total_conversations = len(index)
             total_messages = sum(meta.get("total_messages", 0) for meta in index.values())