新增功能 · New features
- 专注模式输入框现在直接借用主界面的官方 composer：
/指令技能、@引用文件与会话、chip、图片附件、IME 输入全部与主视图一致；官方输入框不可用时自动回退到内置输入框。
Focus mode now borrows the official main-view composer as its input bar — slash-command skills, @ file/session references, chips, image attachments and IME behave exactly as in the main view; it falls back to the built-in input bar automatically when unavailable. - 新增设置项“使用官方输入框”（默认开启，可在插件设置中关闭以使用内置输入框）。
New "use the official composer" preference (default on; turn it off to use the built-in input bar). - 借用形态下的焦点/折叠/Escape 分层与内置输入框行为一致（失焦折叠为胶囊、Esc 先关官方菜单再收输入框、退出不残留）。
Under the borrowed form, focus/collapse/Esc peeling match the built-in bar (blur folds to the pill, Esc closes a host menu before peeling the bar, nothing leaks on exit).
修复 · Bug fixes
- 底部预留高度从 110px 加高到 160px：官方输入框（含空白会话的 hero 形态，136px）不再遮挡对话最底部的文字。
Bottom clearance raised from 110px to 160px: the taller official composer (hero variant spans 136px) no longer hides the last text rows at the scroll end. - 借用探测与交接共用同一选择器；宿主 DOM 变化时安全降级到内置输入框，而不是静默失效。
Probe and handoff share one selector pair; host DOM drift degrades safely to the built-in bar instead of failing silently. - 提升的座位元素不再绘制任何背景/阴影（消除输入框后的半透明方形背景），空白区域点击穿透。
The lifted seat paints no background or shadow (removes the translucent square behind the bar) and its empty area is click-transparent.
Full Changelog: v0.11.3...v0.12.0