diff --git a/lib/host.js b/lib/host.js
index b6c249a..015e9f0 100644
--- a/lib/host.js
+++ b/lib/host.js
@@ -330,7 +330,7 @@ export function apply(ctx, config) {
           const denom = input + read
           if (denom > 0) out.cacheHit = read / denom
         }
-        let capacity = contextWindows.get(id) || modelContext()
+        let capacity = contextWindows.get(id) || modelContext() || 1000000 // 兜底：DSH 常用 1M 上下文
         const used = m.surfaceTokens ?? m.totalTokens
         if (capacity && used) out.contextUsed = Math.min(1, used / capacity)
       }
diff --git a/shell/float-window.ps1 b/shell/float-window.ps1
index 022cdf1..ea1877f 100644
--- a/shell/float-window.ps1
+++ b/shell/float-window.ps1
@@ -69,7 +69,11 @@ $commandFile = Join-Path $stateDir 'command.json'
 $aliveFile = Join-Path $stateDir 'alive.json'
 # 文件桥：插件每秒写 snapshot.json（桌面壳 HTTP 网关 403，浮窗只能走文件）
 $snapshotFile = Join-Path $DshHome 'float-window\snapshot.json'
+$bridgeSnapshotFile = Join-Path $DshHome 'float-window\snapshot-bridge.json'
 $outboxFile = Join-Path $DshHome 'float-window\outbox.json'
+$watchFile = Join-Path $DshHome 'float-window\watch.json'
+# 独立镜像桥：直接读会话日志/投影缓存（DSH 还没重启、插件没在写快照时的兜底数据源）
+$bridgeScript = Join-Path (Split-Path $PSScriptRoot -Parent) 'tools\mirror-bridge.mjs'
 if ($alreadyRunning) {
     if ($Action) {
         try {
@@ -387,7 +391,13 @@ $onWebMessage = {
         'scale'      { $script:state.scale = [double]$m.value; $wv.ZoomFactor = [double]$m.value; Save-State; Push-State }
         'reload'     { $wv.Reload() }
         'chat'       { Write-Outbox @{ cmd = 'chat'; text = [string]$m.text } }
-        'watch'      { Write-Outbox @{ cmd = 'watch'; sessionId = [string]$m.sessionId } }
+        'watch'      {
+            Write-Outbox @{ cmd = 'watch'; sessionId = [string]$m.sessionId }
+            # 镜像桥也跟随同一个选择
+            try {
+                [System.IO.File]::WriteAllText($watchFile, (@{ sessionId = [string]$m.sessionId } | ConvertTo-Json -Compress), (New-Object System.Text.UTF8Encoding($false)))
+            } catch { }
+        }
         'newSession' { Write-Outbox @{ cmd = 'session'; action = 'create' } }
         'openExternal' { if ($m.url -match '^https?://') { Start-Process $m.url } }
     }
@@ -427,7 +437,28 @@ $timer.Add_Tick({
                 $s = [System.IO.File]::ReadAllText($snapshotFile, [System.Text.Encoding]::UTF8)
                 if ($s -and $s -ne $script:lastSnapshotText) {
                     $script:lastSnapshotText = $s
-                    Send-ToPage @{ type = 'snapshot'; data = ($s | ConvertFrom-Json) }
+                    $snap = $s | ConvertFrom-Json
+                    # 用镜像桥的兜底快照补齐插件缺的字段（token/上下文估算、标题）
+                    try {
+                        if (Test-Path $bridgeSnapshotFile) {
+                            $bs = [System.IO.File]::ReadAllText($bridgeSnapshotFile, [System.Text.Encoding]::UTF8) | ConvertFrom-Json
+                            if ($bs -and $bs.sessionId -eq $snap.sessionId) {
+                                if ($null -eq $snap.metrics.contextUsed) { $snap.metrics.contextUsed = $bs.metrics.contextUsed }
+                                if ($null -eq $snap.metrics.tokens) { $snap.metrics.tokens = $bs.metrics.tokens }
+                                if ($null -eq $snap.metrics.cacheHit) { $snap.metrics.cacheHit = $bs.metrics.cacheHit }
+                                if ($null -eq $snap.metrics.tps -and $bs.metrics.tps) { $snap.metrics.tps = $bs.metrics.tps }
+                                if (-not $snap.title -and $bs.title) { $snap.title = $bs.title }
+                                if ($bs.approx) { $snap.approx = $true }
+                            }
+                        }
+                    } catch { }
+                    Send-ToPage @{ type = 'snapshot'; data = $snap }
+                    # 每 ~5 秒记一行，用来确认数据真的到了页面
+                    $now = Get-Date
+                    if (-not $script:lastSnapLog -or ($now - $script:lastSnapLog).TotalSeconds -gt 5) {
+                        $script:lastSnapLog = $now
+                        Log "snapshot -> page: src=$($snap.source) rows=$(@($snap.messages).Count) turns=$($snap.metrics.turns) steps=$($snap.metrics.steps) tok=$($snap.metrics.tokens) ctx=$($snap.metrics.contextUsed) approx=$($snap.approx)"
+                    }
                 }
             }
         } catch { Log "snapshot error: $($_.Exception.Message)" }
@@ -471,6 +502,16 @@ $onWvReady = {
 $wv.add_CoreWebView2InitializationCompleted($onWvReady)
 $form.Add_Shown({
         Log 'form shown'
+        # 独立镜像桥：以隐藏窗口跑起来（DSH 没重启时也能出镜像与指标）
+        try {
+            if (Test-Path $bridgeScript) {
+                $nodeExe = (Get-Command node -ErrorAction SilentlyContinue).Source
+                if ($nodeExe) {
+                    $script:bridge = Start-Process -FilePath $nodeExe -ArgumentList @("`"$bridgeScript`"", '--home', "`"$DshHome`"", '--quiet') -WindowStyle Hidden -PassThru
+                    Log "mirror bridge pid=$($script:bridge.Id)"
+                } else { Log 'node not found; mirror bridge skipped' }
+            } else { Log "bridge script missing: $bridgeScript" }
+        } catch { Log "bridge start failed: $($_.Exception.Message)" }
         $form.AllowResize = -not $script:state.sizeLock
         try {
             $udf = Join-Path $stateDir 'webview2'
@@ -489,7 +530,10 @@ $form.Add_Shown({
 
 $form.Add_ResizeEnd({ if (-not $script:state.fullscreen) { $script:state.w = $form.Width; $script:state.h = $form.Height; Save-State; Push-State } })
 $form.Add_Move({ if (-not $script:state.fullscreen -and $form.WindowState -eq 'Normal') { $script:state.x = $form.Left; $script:state.y = $form.Top } })
-$form.Add_FormClosing({ Save-State })
+$form.Add_FormClosing({
+        Save-State
+        try { if ($script:bridge -and -not $script:bridge.HasExited) { $script:bridge.Kill() } } catch { }
+    })
 $form.Add_KeyDown({
         param($s, $e)
         if ($e.KeyCode -eq [System.Windows.Forms.Keys]::F11) { Toggle-Fullscreen }
diff --git a/shell/ui.html b/shell/ui.html
index 2dfcec8..6a3a940 100644
--- a/shell/ui.html
+++ b/shell/ui.html
@@ -539,8 +539,7 @@
     <div id="app">
         <div id="bar">
             <div class="dot wait" id="dot"></div>
-            <div id="title"><span id="titleText">DSH 悬浮窗</span><small id="sub">未连接</small></div>
-            <button class="tbtn" id="bSess" title="切换要镜像的会话">
+            <div id="title"><span id="titleText">DSH 悬浮窗</span><small id="sub">未连接</small></div>            <button class="tbtn" id="bSess" title="切换要镜像的会话">
                 <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round">
                     <path d="M4 8h13l-3-3M20 16H7l3 3" />
                 </svg>
@@ -706,7 +705,8 @@
             const live = !!(ep && ep.baseUrl)
             ENDPOINT = live ? ep.baseUrl : null
             $('dot').className = 'dot ' + (live ? 'live' : 'wait')
-            $('sub').textContent = live ? ep.baseUrl.replace(/^https?:\/\//, '') : '未连接'
+            // 不再显示 IP：只在没连上时给一个状态词
+            $('sub').textContent = live ? '' : '未连接'
             $('input').disabled = !live
             $('send').disabled = !live
             document.body.classList.toggle('linked', live)
@@ -760,7 +760,8 @@
             if (!msg) return
             if (msg.type === 'cmd') return handleCmd(msg.cmd)
             if (msg.type === 'snapshot') {          // 文件桥来的快照
-                markLive('本地桥')
+                markLive(msg.data && msg.data.approx ? '≈ 估算' : '本地桥')
+                APPROX = !!(msg.data && msg.data.approx)
                 return render(msg.data)
             }
             if (msg.settings && !settingsApplied) { settingsApplied = true; applyDshSettings(msg.settings) }
@@ -776,6 +777,7 @@
         /* ---------------- 会话切换 ---------------- */
         let SESSIONS = []
         let PINNED = null
+        let APPROX = false
         function renderSessions() {
             const box = $('sessList')
             box.innerHTML = ''
@@ -804,7 +806,7 @@
         function metrics(m) {
             $('m-turn').textContent = m.turns ?? '—'
             $('m-step').textContent = m.steps ?? '—'
-            $('m-tps').textContent = m.tps == null ? '—' : Number(m.tps).toFixed(1)
+            $('m-tps').textContent = m.tps == null ? '—' : (APPROX ? '≈' : '') + Number(m.tps).toFixed(1)
             $('m-mtok').textContent = m.tokens == null ? '—' : (m.tokens / 1e6).toFixed(3)
             $('m-cache').textContent = m.cacheHit == null ? '—' : Math.round(m.cacheHit * 100) + '%'
             if (m.contextUsed == null) {
diff --git a/tools/mirror-bridge.mjs b/tools/mirror-bridge.mjs
new file mode 100644
index 0000000..442b8ca
--- /dev/null
+++ b/tools/mirror-bridge.mjs
@@ -0,0 +1,223 @@
+/**
+ * mirror-bridge.mjs — 独立镜像桥（不依赖 DSH 插件重启）
+ *
+ * 为什么不走插件：桌面壳（DSH Desktop）的 HTTP 网关对未认证请求一律 403，浮窗是独立进程拿不到
+ * cookie；而插件要重启 DSH 才会加载新版。所以这里直接读宿主自己的落盘数据：
+ *
+ *   %DSH_HOME%/storages/session_projcache.json   ← 每个会话的投影：标题 / 轮步 / 令牌 / 上下文压力
+ *   %DSH_HOME%/sessions/<proj>/<sid>/session.jsonl.zstd ← 会话事件流（多帧 zstd）→ 消息行
+ *
+ * 产物：%DSH_HOME%/float-window/snapshot.json（与插件写的同一份 schema），浮窗每秒读它渲染。
+ * 只有当插件没在写（mtime 超过 3s）时才写，避免两边打架。
+ *
+ * 用法：node tools/mirror-bridge.mjs [--home <DSH_HOME>] [--interval 1200] [--once]
+ */
+import fs from 'node:fs'
+import path from 'node:path'
+import os from 'node:os'
+import zlib from 'node:zlib'
+
+const argv = process.argv.slice(2)
+const arg = (name, def) => {
+  const i = argv.indexOf(name)
+  return i >= 0 && argv[i + 1] ? argv[i + 1] : def
+}
+const HOME = arg('--home', process.env.DSH_HOME || path.join(os.homedir(), '.dsh'))
+const INTERVAL = Number(arg('--interval', '1200'))
+const ONCE = argv.includes('--once')
+const STATE_DIR = path.join(HOME, 'float-window')
+const SNAPSHOT = path.join(STATE_DIR, 'snapshot.json')
+const SNAPSHOT_BRIDGE = path.join(STATE_DIR, 'snapshot-bridge.json')
+const WATCH = path.join(STATE_DIR, 'watch.json')
+
+const log = (...a) => { if (!argv.includes('--quiet')) console.log('[bridge]', ...a) }
+
+const ZSTD_MAGIC = Buffer.from([0x28, 0xb5, 0x2f, 0xfd])
+
+/** DSH 往同一个 .zstd 文件追加多个帧，zstdDecompressSync 只吃第一帧 → 按魔数切开逐帧解 */
+function decompressFrames(buf) {
+  let out = ''
+  let idx = buf.indexOf(ZSTD_MAGIC)
+  while (idx !== -1) {
+    const next = buf.indexOf(ZSTD_MAGIC, idx + 4)
+    const end = next === -1 ? buf.length : next
+    try { out += zlib.zstdDecompressSync(buf.subarray(idx, end)).toString('utf8') } catch { }
+    idx = next
+  }
+  return out
+}
+
+function readJson(file) {
+  try { return JSON.parse(fs.readFileSync(file, 'utf8')) } catch { return null }
+}
+
+function listSessionLogs() {
+  const root = path.join(HOME, 'sessions')
+  const out = []
+  if (!fs.existsSync(root)) return out
+  for (const proj of fs.readdirSync(root)) {
+    const pdir = path.join(root, proj)
+    let isDir = false
+    try { isDir = fs.statSync(pdir).isDirectory() } catch { }
+    if (!isDir) continue
+    for (const sid of fs.readdirSync(pdir)) {
+      const f = path.join(pdir, sid, 'session.jsonl.zstd')
+      try { out.push({ file: f, sid, mtime: fs.statSync(f).mtimeMs }) } catch { }
+    }
+  }
+  return out.sort((a, b) => b.mtime - a.mtime)
+}
+
+function textOf(content) {
+  if (typeof content === 'string') return content
+  if (Array.isArray(content)) return content.map((c) => (typeof c === 'string' ? c : (c?.text ?? ''))).join('')
+  return ''
+}
+const clip = (s, n = 4000) => (s.length > n ? s.slice(0, n) + '…' : s)
+
+/** 事件流 → 浮窗消息行 + 实时指标（轮/步精确；token 用字符估算，标 ≈） */
+function rowsFromLog(text) {
+  const rows = []
+  const titles = new Map()
+  let turns = 0
+  let steps = 0
+  let outChars = 0
+  let userChars = 0
+  let contextWindow = null
+  let streamStart = 0
+  let streamChars = 0
+  let lastChunkAt = 0
+  const est = (chars) => Math.round(chars / 3.2) // 中英混排的粗略 token 估算
+
+  for (const line of text.split('\n')) {
+    if (!line) continue
+    let e
+    try { e = JSON.parse(line) } catch { continue }
+    const type = String(e?.type || '')
+    const d = e?.data || e || {}
+    const t = e?.time || 0
+    if (type === 'turn/start') turns++
+    else if (type === 'step/start') steps++
+    else if (type === 'request/context' && d.contextWindow) contextWindow = d.contextWindow
+    else if (type === 'session/title' && d.title) titles.set('title', String(d.title))
+    else if (type === 'user/message') {
+      if (d.source?.kind && d.source.kind !== 'user') continue
+      const s = textOf(d.content)
+      if (s) { userChars += s.length; rows.push({ role: 'user', text: clip(s) }) }
+    } else if (type === 'assistant/message') {
+      const s = textOf(d.content ?? d.message?.content)
+      if (s) { outChars += s.length; rows.push({ role: 'assistant', text: clip(s) }) }
+    } else if (type === 'assistant/chunk') {
+      const c = d.chunk || {}
+      const kind = String(c.type || '')
+      const piece = c.text ?? c.delta ?? (kind.includes('text') ? c.content : '')
+      if (piece) {
+        const now = t || Date.now()
+        if (!streamStart || now - lastChunkAt > 8000) { streamStart = now; streamChars = 0 }
+        lastChunkAt = now
+        streamChars += String(piece).length
+        outChars += String(piece).length
+        const last = rows[rows.length - 1]
+        if (last && last.role === 'assistant' && last.streaming) last.text += piece
+        else rows.push({ role: 'assistant', text: String(piece), streaming: true })
+      } else if (kind === 'finish' && c.reason?.kind === 'error') {
+        rows.push({ role: 'assistant', text: '⚠️ ' + String(c.reason.failure?.message || c.reason.failure || 'error').slice(0, 300) })
+      }
+    } else if (type === 'tool/call') {
+      rows.push({ role: 'tool', text: `${d.name || 'tool'}(${JSON.stringify(d.args ?? '').slice(0, 120)})` })
+    }
+  }
+  for (const r of rows) delete r.streaming
+  const streaming = lastChunkAt && Date.now() - lastChunkAt < 8000
+  const tps = streaming && streamStart ? est(streamChars) / Math.max(0.5, (lastChunkAt - streamStart) / 1000) : null
+  return {
+    rows, titles, turns, steps, streaming,
+    metrics: {
+      turns,
+      steps,
+      tps,
+      tokens: outChars ? est(outChars + userChars) : null,
+      cacheHit: null,
+      contextUsed: contextWindow ? Math.min(1, est(userChars + outChars) / contextWindow) : null,
+    },
+  }
+}
+
+function buildSnapshot() {
+  const cache = readJson(path.join(HOME, 'storages', 'session_projcache.json'))
+  const table = cache?.tables?.sessions || {}
+  const watch = readJson(WATCH)
+  const logs = listSessionLogs()
+
+  // 会话清单：以**日志**为主（实时 mtime），投影缓存只用于补标题/历史统计
+  const entries = []
+  for (const l of logs) {
+    const rows = table[l.sid]?.rows || table[l.sid.replace(/^session-/, '')]?.rows || {}
+    const stats = rows.sessionStats?.val || {}
+    entries.push({
+      id: l.sid,
+      title: rows.title?.val || null,
+      cacheTurns: stats.turns ?? null,
+      cacheSteps: stats.steps ?? null,
+      mtime: l.mtime,
+      log: l,
+    })
+  }
+
+  // 当前会话：watch.json 指定优先，否则"日志最新"（真正在跑的那个）
+  let active = null
+  if (watch?.sessionId) active = entries.find((e) => e.id === watch.sessionId || e.id.replace(/^session-/, '') === watch.sessionId) || null
+  if (!active) active = entries.sort((a, b) => b.mtime - a.mtime)[0] || null
+  if (!active) return null
+
+  let rows = []
+  let title = active.title
+  let metrics = { turns: active.cacheTurns, steps: active.cacheSteps, tps: null, tokens: null, cacheHit: null, contextUsed: null }
+  let streaming = false
+  try {
+    const parsed = rowsFromLog(decompressFrames(fs.readFileSync(active.log.file)))
+    rows = parsed.rows.slice(-40)
+    title = title || parsed.titles.get('title') || null
+    streaming = parsed.streaming
+    // 轮/步取实时计数（缓存的那份是周期性落盘的，可能滞后）
+    metrics = {
+      ...parsed.metrics,
+      turns: Math.max(parsed.metrics.turns, active.cacheTurns || 0),
+      steps: Math.max(parsed.metrics.steps, active.cacheSteps || 0),
+    }
+  } catch (e) { log('log read failed:', String(e?.message || e)) }
+
+  return {
+    ok: true,
+    at: Date.now(),
+    source: 'mirror-bridge',
+    approx: true, // token/上下文是字符估算，界面上会带 ≈
+    streaming,
+    sessionId: active.id,
+    pinned: watch?.sessionId || null,
+    title,
+    messages: rows,
+    metrics,
+    sessions: entries.slice(0, 20).map((e) => ({ id: e.id, title: e.title, turns: e.cacheTurns || 0, steps: e.cacheSteps || 0, messages: 0, active: e.id === active.id })),
+  }
+}
+
+function writeSnapshot() {
+  try {
+    const snap = buildSnapshot()
+    if (!snap) return
+    fs.mkdirSync(STATE_DIR, { recursive: true })
+    // 兜底文件总是写：插件缺的字段（token/上下文估算、标题）由浮窗用它补齐
+    fs.writeFileSync(SNAPSHOT_BRIDGE, JSON.stringify(snap))
+    // 插件在写就不抢 snapshot.json：mtime 3 秒内视为它的
+    try {
+      const st = fs.statSync(SNAPSHOT)
+      if (Date.now() - st.mtimeMs < 3000 && readJson(SNAPSHOT)?.source !== 'mirror-bridge') return
+    } catch { }
+    fs.writeFileSync(SNAPSHOT, JSON.stringify(snap))
+    log(`snapshot: ${snap.sessionId} "${(snap.title || '').slice(0, 24)}" turns=${snap.metrics.turns} steps=${snap.metrics.steps} rows=${snap.messages.length} ctx=${snap.metrics.contextUsed == null ? '-' : Math.round(snap.metrics.contextUsed * 100) + '%'}`)
+  } catch (e) { log('write failed:', String(e?.message || e)) }
+}
+
+writeSnapshot()
+if (!ONCE) setInterval(writeSnapshot, INTERVAL)