fix: 终端 ⌘V 粘贴图片失效（#27 回归） - #50
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alchaincyf#27 的复制粘贴修复给 ⌘V 加了自定义处理器，只在 readText() 拿到非空文本时 才调 xterm.paste。但图片粘贴靠的是 claude 收到粘贴信号（bracketed paste 序列）后主动读系统剪贴板取图；纯图片剪贴板的 readText() 返回空串/reject， 于是 xterm.paste 从不被调用，claude 收不到信号，图片粘贴回归失效。 改为无论文本是否为空都 xterm.paste(text || '')，reject 分支同样补发 xterm.paste('')，还原 alchaincyf#27 之前的行为。空 bracketed paste 对 shell/claude 是无害 no-op，仅作为让 claude 去读剪贴板的触发信号；文本粘贴与 ⌘C 复制不受影响。 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
前一提交让 ⌘V 处理器对空文本也 xterm.paste('') 发 bracketed-paste 信号
以修复图片粘贴，但撞上了 xterm 自带的原生 paste 监听：同一次按键两条路径
各发一遍空信号，claude 便读两次系统剪贴板 → 图片粘两张。Cmd+V 时 preventDefault
顺带压掉了原生事件，Ctrl+V 压不住，故只有 Ctrl+V 双发。
键盘接管粘贴时打时间戳，捕获阶段一次性拦掉紧随其后（<60ms）的那次原生 paste，
避免双发；拦截时把原生事件携带的 clipboardData 文本存下，供 readText 失败时兜底，
不丢文本粘贴。鼠标点「编辑→粘贴」无前置按键戳，不拦，保持可用。
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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问题
自 #27（终端复制粘贴修复）起，在终端里对 claude 等 TUI 按 ⌘V 粘贴图片失效；粘贴文本正常。
根因
#27 给 ⌘V 加了自定义键盘处理器（
public/app.js），只在readText()拿到非空文本时才调xterm.paste：图片粘贴的机制是：终端把 bracketed-paste 信号（
\x1b[200~…\x1b[201~）发给 PTY，claude 收到后主动读系统剪贴板取图。纯图片剪贴板的readText()返回空串/reject，if (text)为假 →xterm.paste从不触发 → claude 收不到信号 → 不读剪贴板 → 图片粘贴失效。修复
无论文本是否为空都转发
xterm.paste(text || '')，reject 分支补发xterm.paste('')，还原 #27 之前 xterm 默认粘贴路径。影响面
文本粘贴、⌘C 复制、字号缩放、右键菜单均不受影响。空 bracketed paste 对 shell/claude 是无害 no-op，仅作触发信号。
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