diff --git a/chfs-ng/internal/api/web/index.html b/chfs-ng/internal/api/web/index.html
index a7b8e26..4a8d434 100644
--- a/chfs-ng/internal/api/web/index.html
+++ b/chfs-ng/internal/api/web/index.html
@@ -57,15 +57,16 @@ function svgIcon(type){const p={folder:'<path d="M3 6.5h6l2 2H21v9.5a2 2 0 0 1-2
 function selectItem(p,checked){if(checked)selected.add(p);else selected.delete(p);updateSelection();renderList(lastItems)}
 let selected=new Set(),lastItems=[];
 function render(items){lastItems=items;selected=new Set([...selected].filter(p=>items.some(f=>(current?current+"/":"")+f.name===p)));renderList(items);renderGrid(items);updateSelection()}
-function renderList(items){const body=$("files");body.innerHTML=items.map(f=>{const p=current?current+"/"+f.name:f.name,canRead=(f.mask||"").includes("R"),canWrite=(f.mask||"").includes("W"),canDelete=(f.mask||"").includes("D"),selectedNow=selected.has(p);const perms='<span class="perm-dot '+(canRead?'read':'')+'"></span><span class="perm-dot '+(canWrite?'write':'')+'"></span><span class="perm-dot '+(canDelete?'delete':'')+'"></span>';return '<tr class="file-row '+(selectedNow?'selected':'')+'"><td><input class="selectbox" type="checkbox" '+(selectedNow?"checked":"")+' onchange="selectItem('+JSON.stringify(p)+',this.checked)"></td><td><div class="name"><span class="file-kind">'+iconFor(f)+'</span>'+(f.dir&&canRead?'<a href="#" onclick="openDir('+JSON.stringify(p)+');return false">'+esc(f.name)+'</a>':(canRead?'<a href="#" onclick="previewFile('+JSON.stringify(p)+');return false">'+esc(f.name)+'</a>':'<span>'+esc(f.name)+'</span>'))+'</div></td><td class="size-cell">'+(f.dir?"—":fmt(f.size))+'</td><td class="time-cell">'+esc(f.modified||"")+'</td><td class="perm-cell">'+perms+'</td><td><div class="actions"><button class="iconbtn" onclick="itemMenu(event,'+JSON.stringify(p)+')" title="更多操作"><svg class="ui-icon" viewBox="0 0 24 24"><circle cx="5" cy="12" r="1"/><circle cx="12" cy="12" r="1"/><circle cx="19" cy="12" r="1"/></svg></button></div></td></tr>'}).join("")||'<tr><td colspan="6" class="empty">这里还没有文件</td></tr>'}
-function renderGrid(items){$("grid").innerHTML=items.map(f=>{const p=current?current+"/"+f.name:f.name,canRead=(f.mask||"").includes("R"),type=fileType(f),selectedNow=selected.has(p);let thumb=iconFor(f);if(type==="image"&&canRead)thumb='<img src="/chfs/preview?file='+encodeURIComponent(p)+'" loading="lazy" alt="">';const tileClass=(f.dir?'folder-tile ':'')+(['video','audio'].includes(type)?'media-tile':'');const meta=f.dir?'文件夹':fmt(f.size);return '<div class="tile '+tileClass+(selectedNow?' selected':'')+'" onclick="'+(f.dir&&canRead?'openDir('+JSON.stringify(p)+')':'toggleTile('+JSON.stringify(p)+')')+'" oncontextmenu="itemMenu(event,'+JSON.stringify(p)+');return false"><input class="selectbox tile-check" type="checkbox" '+(selectedNow?'checked':'')+' onclick="event.stopPropagation();selectItem('+JSON.stringify(p)+',this.checked)"><button class="iconbtn tile-action" onclick="event.stopPropagation();itemMenu(event,'+JSON.stringify(p)+')" title="更多操作"><svg class="ui-icon" viewBox="0 0 24 24"><circle cx="5" cy="12" r="1"/><circle cx="12" cy="12" r="1"/><circle cx="19" cy="12" r="1"/></svg></button><div class="thumb">'+thumb+'</div><div class="tile-title">'+iconFor(f)+'<div class="file-name">'+esc(f.name)+'</div></div><div class="tile-meta"><span>'+meta+'</span>'+(f.modified?'<span>'+esc(f.modified)+'</span>':'')+'</div></div>'}).join('')||'<div class="empty">这里还没有文件</div>'}
+function renderList(items){const body=$("files");body.innerHTML=items.map(f=>{const p=current?current+"/"+f.name:f.name,canRead=(f.mask||"").includes("R"),canWrite=(f.mask||"").includes("W"),canDelete=(f.mask||"").includes("D"),selectedNow=selected.has(p);const perms='<span class="perm-dot '+(canRead?'read':'')+'"></span><span class="perm-dot '+(canWrite?'write':'')+'"></span><span class="perm-dot '+(canDelete?'delete':'')+'"></span>';return '<tr class="file-row '+(selectedNow?'selected':'')+'" onclick="selectItem('+JSON.stringify(p)+',true)" ondblclick="activateItem('+JSON.stringify(p)+')"><td><input class="selectbox" type="checkbox" '+(selectedNow?"checked":"")+' onclick="event.stopPropagation()" onchange="selectItem('+JSON.stringify(p)+',this.checked)"></td><td><div class="name"><span class="file-kind">'+iconFor(f)+'</span><span>'+esc(f.name)+'</span></div></td><td class="size-cell">'+(f.dir?"—":fmt(f.size))+'</td><td class="time-cell">'+esc(f.modified||"")+'</td><td class="perm-cell">'+perms+'</td><td><div class="actions"><button class="iconbtn" onclick="itemMenu(event,'+JSON.stringify(p)+')" title="更多操作"><svg class="ui-icon" viewBox="0 0 24 24"><circle cx="5" cy="12" r="1"/><circle cx="12" cy="12" r="1"/><circle cx="19" cy="12" r="1"/></svg></button></div></td></tr>'}).join("")||'<tr><td colspan="6" class="empty">这里还没有文件</td></tr>'}
+function renderGrid(items){$("grid").innerHTML=items.map(f=>{const p=current?current+"/"+f.name:f.name,canRead=(f.mask||"").includes("R"),type=fileType(f),selectedNow=selected.has(p);let thumb=iconFor(f);if(type==="image"&&canRead)thumb='<img src="/chfs/preview?file='+encodeURIComponent(p)+'" loading="lazy" alt="">';const tileClass=(f.dir?'folder-tile ':'')+(['video','audio'].includes(type)?'media-tile':'');const meta=f.dir?'文件夹':fmt(f.size);return '<div class="tile '+tileClass+(selectedNow?' selected':'')+'" onclick="selectItem('+JSON.stringify(p)+',true)" ondblclick="activateItem('+JSON.stringify(p)+')" oncontextmenu="itemMenu(event,'+JSON.stringify(p)+');return false"><input class="selectbox tile-check" type="checkbox" '+(selectedNow?'checked':'')+' onclick="event.stopPropagation();selectItem('+JSON.stringify(p)+',this.checked)"><button class="iconbtn tile-action" onclick="event.stopPropagation();itemMenu(event,'+JSON.stringify(p)+')" title="更多操作"><svg class="ui-icon" viewBox="0 0 24 24"><circle cx="5" cy="12" r="1"/><circle cx="12" cy="12" r="1"/><circle cx="19" cy="12" r="1"/></svg></button><div class="thumb">'+thumb+'</div><div class="tile-title">'+iconFor(f)+'<div class="file-name">'+esc(f.name)+'</div></div><div class="tile-meta"><span>'+meta+'</span>'+(f.modified?'<span>'+esc(f.modified)+'</span>':'')+'</div></div>'}).join('')||'<div class="empty">这里还没有文件</div>'}
+function activateItem(p){const f=lastItems.find(x=>(current?current+"/":"")+x.name===p);if(!f)return;if(f.dir&&(f.mask||"").includes("R"))openDir(p);else if((f.mask||"").includes("R"))previewFile(p)}
 function toggleTile(p){selectItem(p,!selected.has(p))}
 function openSelected(){if(selected.size!==1)return;const p=[...selected][0],f=lastItems.find(x=>(current?current+"/":"")+x.name===p);if(!f)return;if(f.dir&&(f.mask||"").includes("R"))openDir(p);else if((f.mask||"").includes("R"))previewFile(p)}
 function toggleAll(v){lastItems.forEach(f=>{const p=current?current+"/"+f.name:f.name;if(v)selected.add(p);else selected.delete(p)});render(lastItems)}
 function clearSelection(){selected.clear();updateSelection();renderGrid(lastItems);renderList(lastItems)}
 function updateSelection(){const n=selected.size;$("bulk").classList.toggle("show",n>0);$("selectedCount").textContent=n?`已选择 ${n} 项`:"";$("grid").querySelectorAll('.tile').forEach((el,i)=>{const f=lastItems[i];if(f)el.classList.toggle('selected',selected.has(current?current+'/'+f.name:f.name))})}
 function setView(v){localStorage.setItem('chfs-view',v);$("files").parentElement.hidden=v==='grid';$("grid").hidden=v!=='grid';document.querySelectorAll('.viewbtn').forEach(b=>b.classList.remove('active'));$(v+'Btn').classList.add('active')}
-function itemMenu(e,p){e.preventDefault();const f=lastItems.find(x=>(current?current+'/':'')+x.name===p);const canRead=(f?.mask||'').includes('R'),canWrite=(f?.mask||'').includes('W'),canDelete=(f?.mask||'').includes('D');let html='';if(canRead)html+='<button onclick="downloadFile('+JSON.stringify(p)+');closeContext()">下载</button>';if(f?.dir&&canRead)html+='<button onclick="downloadDir('+JSON.stringify(p)+');closeContext()">下载 ZIP</button>';if(canWrite)html+='<button onclick="renameItem('+JSON.stringify(p)+');closeContext()">重命名</button><button onclick="transferItem('+JSON.stringify(p)+',false);closeContext()">移动到…</button><button onclick="transferItem('+JSON.stringify(p)+',true);closeContext()">复制到…</button>';if(canDelete)html+='<button onclick="removeItem('+JSON.stringify(p)+');closeContext()">删除</button>';if(f?.guestMask?.includes('R'))html+='<button onclick="shareItem('+JSON.stringify(p)+');closeContext()">分享</button>';if(!html)html='<div class="meta" style="padding:8px">没有可用操作</div>';$("context").innerHTML=html;$("context").style.left=Math.min(e.clientX,innerWidth-190)+'px';$("context").style.top=Math.min(e.clientY,innerHeight-220)+'px';$("context").style.display='block'}
+function itemMenu(e,p){e.preventDefault();if(!selected.has(p)){selected.clear();selected.add(p);updateSelection();renderList(lastItems);renderGrid(lastItems)}const f=lastItems.find(x=>(current?current+'/':'')+x.name===p);const canRead=(f?.mask||'').includes('R'),canWrite=(f?.mask||'').includes('W'),canDelete=(f?.mask||'').includes('D');let html='';if(canRead)html+='<button onclick="downloadFile('+JSON.stringify(p)+');closeContext()">下载</button>';if(f?.dir&&canRead)html+='<button onclick="downloadDir('+JSON.stringify(p)+');closeContext()">下载 ZIP</button>';if(canWrite)html+='<button onclick="renameItem('+JSON.stringify(p)+');closeContext()">重命名</button><button onclick="transferItem('+JSON.stringify(p)+',false);closeContext()">移动到…</button><button onclick="transferItem('+JSON.stringify(p)+',true);closeContext()">复制到…</button>';if(canDelete)html+='<button onclick="removeItem('+JSON.stringify(p)+');closeContext()">删除</button>';if(f?.guestMask?.includes('R'))html+='<button onclick="shareItem('+JSON.stringify(p)+');closeContext()">分享</button>';if(!html)html='<div class="meta" style="padding:8px">没有可用操作</div>';$("context").innerHTML=html;$("context").style.left=Math.min(e.clientX,innerWidth-190)+'px';$("context").style.top=Math.min(e.clientY,innerHeight-220)+'px';$("context").style.display='block'}
 function closeContext(){$("context").style.display='none'}
 addEventListener('click',e=>{if(!e.target.closest('#context')&&!e.target.closest('.tilemenu'))closeContext()});
 function bulkDownload(){if(!selected.size)return;const q=[...selected].map(p=>'path='+encodeURIComponent(p)).join('&');location.href='/chfs/downloadzip?'+q}