diff --git a/VERSION b/VERSION
index 69bf493e..c7c49b4b 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.27.5
+0.27.6
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 4e541631..aa35d78e 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -8,6 +8,16 @@ This project follows the repository versioning rule:
 - `improvement` -> `+0.0.1`（bugfix + 小功能混合）
 - `bugfix` -> `+0.0.1`
 
+## [0.27.6] — 2026-04-15
+
+### 🔧 Improvements
+- BGP 告警页表格纵向 overflow 修复：补全 flex 布局链，tabs content-holder 正确撑满剩余高度
+- 用户管理表格横向滚动修复：采用 flex-fill 方案替换 `height: auto !important`，自定义滚动条 X 轨道位置对齐表格底部
+- Playground 宽布局隐藏"服务状态"按钮：侧边栏可见时不显示冗余入口
+- AI Chatbox 输入框失焦收起为单行，聚焦或有内容时展开完整 composer
+
+---
+
 ## [0.27.4] — 2026-04-14
 
 ### 🔧 Improvements
diff --git a/docs/version-history.md b/docs/version-history.md
index 0c613094..c1de6049 100644
--- a/docs/version-history.md
+++ b/docs/version-history.md
@@ -16,12 +16,13 @@
 ## Current Version
 
 - `main` 当前主线历史推导到：`0.16.5`
-- `dev` 当前开发分支历史推导到：`0.27.5`
+- `dev` 当前开发分支历史推导到：`0.27.6`
 
 ## Timeline
 
 | Version | Type | Branch | Commit | Summary |
 | --- | --- | --- | --- | --- |
+| `0.27.6` | improvement | `dev` | `pending` | BGP/用户表格滚动条修复，Playground 响应式按钮与输入框收起优化 |
 | `0.27.5` | bugfix | `dev` | `pending` | 统一控制台自定义滚动条，修复 alerts/BGP 响应式滚动与采集进度完成态显示 |
 | `0.27.4` | improvement | `dev` | — | info-card 懒加载动态挂载，页面初始不再有隐藏节点 |
 | `0.27.3` | improvement | `dev` | — | TV panel 折叠方向稳定、视频跳动修复、图例折叠按钮修复、搜索图标调整 |
diff --git a/frontend/package.json b/frontend/package.json
index 06b6446b..1b4946f2 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "planet-frontend",
-  "version": "0.27.5",
+  "version": "0.27.6",
   "private": true,
   "packageManager": "bun@1",
   "dependencies": {
diff --git a/frontend/src/index.css b/frontend/src/index.css
index 4d1ef31d..8435d816 100644
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -390,6 +390,10 @@ body {
   color: #64748b;
 }
 
+.playground-chat__service-btn {
+  display: none;
+}
+
 .playground-card__icon-button:hover {
   color: #1677ff !important;
   background: rgba(22, 119, 255, 0.08) !important;
@@ -534,6 +538,21 @@ body {
   padding: 12px;
 }
 
+.playground-chat__input-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.playground-chat__input-row .playground-chat__input.ant-input {
+  flex: 1 1 auto;
+  min-width: 0;
+}
+
+.playground-chat__input-wrap--expanded .playground-chat__input-row .playground-chat__send-button.ant-btn {
+  flex: 0 0 auto;
+}
+
 .playground-chat__input.ant-input {
   border: 0;
   box-shadow: none;
@@ -543,6 +562,15 @@ body {
   margin-top: 10px;
 }
 
+.playground-chat__input-wrap--expanded .playground-chat__input.ant-input {
+  margin-top: 10px;
+}
+
+.playground-chat__input-wrap:not(.playground-chat__input-wrap--expanded) .playground-chat__input.ant-input {
+  margin-top: 0;
+  padding: 4px 2px;
+}
+
 .playground-chat__input.ant-input:focus,
 .playground-chat__input.ant-input-focused {
   box-shadow: none;
@@ -1288,6 +1316,10 @@ body {
     flex-direction: column;
   }
 
+  .playground-chat__service-btn {
+    display: inline-flex;
+  }
+
   .playground-shell__sidebar {
     display: none;
   }
@@ -1493,10 +1525,26 @@ body {
   min-height: 0;
 }
 
-.users-table-region .ant-table-body {
-  height: auto !important;
+/* users table: flex-fill approach so overlay x-track aligns with table bottom */
+.users-table-region .ant-table-container {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+  min-height: 0;
 }
 
+.users-table-region .ant-table-header {
+  flex: 0 0 auto;
+}
+
+.users-table-region .ant-table-body {
+  flex: 1 1 auto;
+  min-height: 0;
+  height: 0 !important;
+  max-height: none !important;
+}
+
+
 .data-source-table-region .ant-table-wrapper,
 .data-source-table-region .ant-spin-nested-loading,
 .data-source-table-region .ant-spin-container {
@@ -1911,6 +1959,14 @@ body {
   min-width: 0;
 }
 
+.alerts-tab-panel > .ant-space-item:last-child,
+.system-alerts-page__stack > .ant-space-item:last-child,
+.bgp-alerts-page__stack > .ant-space-item:last-child,
+.situational-alerts-page__stack > .ant-space-item:last-child {
+  flex: 1 1 auto;
+  min-height: 0;
+}
+
 .system-alerts-page__table-card,
 .bgp-alerts-page__table-card {
   flex: 1 1 auto;
@@ -1935,8 +1991,22 @@ body {
   min-height: 0;
 }
 
-.bgp-alerts-page__tabs,
-.bgp-alerts-page__tabs .ant-tabs-content-holder,
+.bgp-alerts-page__tabs {
+  min-width: 0;
+  min-height: 0;
+  width: 100%;
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+}
+
+.bgp-alerts-page__tabs .ant-tabs-content-holder {
+  flex: 1 1 auto;
+  min-width: 0;
+  min-height: 0;
+  overflow: hidden;
+}
+
 .bgp-alerts-page__tabs .ant-tabs-content,
 .bgp-alerts-page__tabs .ant-tabs-tabpane {
   min-width: 0;
diff --git a/frontend/src/pages/Playground/Playground.tsx b/frontend/src/pages/Playground/Playground.tsx
index a01cb430..e659e6ad 100644
--- a/frontend/src/pages/Playground/Playground.tsx
+++ b/frontend/src/pages/Playground/Playground.tsx
@@ -239,6 +239,7 @@ function Playground() {
   const [editingContent, setEditingContent] = useState('')
   const [editSaving, setEditSaving] = useState(false)
   const [showScrollToBottom, setShowScrollToBottom] = useState(false)
+  const [composerFocused, setComposerFocused] = useState(false)
   const pollTimerRef = useRef<number | null>(null)
   const messagesContainerRef = useRef<HTMLDivElement | null>(null)
   const messagesShellRef = useRef<HTMLDivElement | null>(null)
@@ -681,7 +682,7 @@ function Playground() {
               title="AI Chatbox"
               extra={(
                 <Space size={4}>
-                  <Tooltip title="服务状态">
+                  <Tooltip title="服务状态" className="playground-chat__service-btn">
                     <Button
                       type="text"
                       shape="circle"
@@ -849,31 +850,50 @@ function Playground() {
               </div>
 
               <div className="playground-chat__composer">
-                <div className="playground-chat__input-wrap">
-                  <div className="playground-preset-strip__actions">
-                    {PLAYGROUND_PRESETS.map((preset) => (
-                      <Tag.CheckableTag
-                        key={preset.key}
-                        checked={preset.key === selectedPreset.key}
-                        onChange={() => handleApplyPreset(preset)}
-                      >
-                        {preset.label}
-                      </Tag.CheckableTag>
-                    ))}
+                <div className={`playground-chat__input-wrap${composerFocused || !!inputValue ? ' playground-chat__input-wrap--expanded' : ''}`}>
+                  {(composerFocused || !!inputValue) && (
+                    <div className="playground-preset-strip__actions">
+                      {PLAYGROUND_PRESETS.map((preset) => (
+                        <Tag.CheckableTag
+                          key={preset.key}
+                          checked={preset.key === selectedPreset.key}
+                          onChange={() => handleApplyPreset(preset)}
+                        >
+                          {preset.label}
+                        </Tag.CheckableTag>
+                      ))}
+                    </div>
+                  )}
+                  <div className="playground-chat__input-row">
+                    <Input.TextArea
+                      value={inputValue}
+                      onChange={(event) => setInputValue(event.target.value)}
+                      autoSize={composerFocused || !!inputValue ? { minRows: 4, maxRows: 10 } : { minRows: 1, maxRows: 1 }}
+                      placeholder="在这里输入本次分析请求..."
+                      className="playground-chat__input"
+                      onFocus={() => setComposerFocused(true)}
+                      onBlur={() => setComposerFocused(false)}
+                      onPressEnter={(event) => {
+                        if (!event.shiftKey) {
+                          event.preventDefault()
+                          void handleSend()
+                        }
+                      }}
+                    />
+                    {!(composerFocused || !!inputValue) && (
+                      <Tooltip title={sendButtonTooltip}>
+                        <Button
+                          type="text"
+                          shape="circle"
+                          className={`playground-chat__send-button${requestPending || streaming ? ' playground-chat__send-button--stop' : ''}`}
+                          icon={requestPending || streaming ? <BorderOutlined /> : <ArrowUpOutlined />}
+                          onClick={requestPending || streaming ? handleStop : () => void handleSend()}
+                          aria-label={sendButtonTooltip}
+                        />
+                      </Tooltip>
+                    )}
                   </div>
-                  <Input.TextArea
-                    value={inputValue}
-                    onChange={(event) => setInputValue(event.target.value)}
-                    autoSize={{ minRows: 4, maxRows: 10 }}
-                    placeholder="在这里输入本次分析请求。你可以写观察、问题、目标，或者直接贴一段待分析事实。"
-                    className="playground-chat__input"
-                    onPressEnter={(event) => {
-                      if (!event.shiftKey) {
-                        event.preventDefault()
-                        void handleSend()
-                      }
-                    }}
-                  />
+                  {(composerFocused || !!inputValue) && (
                     <div className="playground-chat__actions">
                       <div className="playground-chat__hints">
                         <Tag>{title}</Tag>
@@ -890,8 +910,9 @@ function Playground() {
                         />
                       </Tooltip>
                     </div>
-                  </div>
+                  )}
                 </div>
+              </div>
             </Card>
           </div>
         </div>
diff --git a/frontend/src/pages/Users/Users.tsx b/frontend/src/pages/Users/Users.tsx
index 01c88d85..9decd1d5 100644
--- a/frontend/src/pages/Users/Users.tsx
+++ b/frontend/src/pages/Users/Users.tsx
@@ -1,4 +1,4 @@
-import { useEffect, useRef, useState } from 'react'
+import { useEffect, useState } from 'react'
 import { Table, Button, Tag, Space, message, Modal, Form, Input, Select } from 'antd'
 import { PlusOutlined, EditOutlined, DeleteOutlined } from '@ant-design/icons'
 import axios from 'axios'
@@ -19,8 +19,6 @@ function Users() {
   const [loading, setLoading] = useState(false)
   const [modalVisible, setModalVisible] = useState(false)
   const [editingUser, setEditingUser] = useState<User | null>(null)
-  const tableRegionRef = useRef<HTMLDivElement | null>(null)
-  const [tableHeight, setTableHeight] = useState(360)
   const [form] = Form.useForm()
 
   const fetchUsers = async () => {
@@ -37,24 +35,6 @@ function Users() {
     fetchUsers()
   }, [])
 
-  useEffect(() => {
-    const updateTableHeight = () => {
-      const regionHeight = tableRegionRef.current?.offsetHeight || 0
-      setTableHeight(Math.max(220, regionHeight - 56))
-    }
-
-    updateTableHeight()
-
-    if (typeof ResizeObserver === 'undefined') {
-      return undefined
-    }
-
-    const observer = new ResizeObserver(updateTableHeight)
-    if (tableRegionRef.current) observer.observe(tableRegionRef.current)
-
-    return () => observer.disconnect()
-  }, [users.length])
-
   const handleAdd = () => {
     setEditingUser(null)
     form.resetFields()
@@ -145,13 +125,14 @@ function Users() {
           <Button type="primary" icon={<PlusOutlined />} onClick={handleAdd}>添加用户</Button>
         </div>
         <div className="page-shell__body">
-          <TableScrollRegion ref={tableRegionRef} className="data-source-table-region users-table-region" style={{ height: '100%' }}>
+          <TableScrollRegion className="data-source-table-region users-table-region">
             <Table
               columns={columns}
               dataSource={users}
               rowKey="id"
               loading={loading}
-              scroll={{ x: 'max-content', y: tableHeight }}
+              scroll={{ x: 960, y: 10000 }}
+              pagination={false}
               tableLayout="fixed"
             />
           </TableScrollRegion>
diff --git a/pyproject.toml b/pyproject.toml
index 19653598..49b5095c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "planet"
-version = "0.27.5"
+version = "0.27.6"
 description = "智能星球计划 - 态势感知系统"
 requires-python = ">=3.14"
 dependencies = [
diff --git a/uv.lock b/uv.lock
index 9deb45f5..c0c3c537 100644
--- a/uv.lock
+++ b/uv.lock
@@ -475,7 +475,7 @@ wheels = [
 
 [[package]]
 name = "planet"
-version = "0.27.4"
+version = "0.27.6"
 source = { virtual = "." }
 dependencies = [
     { name = "aiofiles" },