feat(workspace): 日历再瘦身 + 右侧面板等高填满 + 日期跳转按钮 + 小屁浮窗化

日历
- 单元格 72→60px，日号 19→17px、字号 11→10px，事件条与周标同步收紧，
  标题区 padding 与提示文案一起压小
- 工具条右边的「月」按钮删掉，换成日历小图标按钮：悬浮/展开变蓝（primary 实底），
  点击弹出迷你月历（自带年月切换 + 回到今天），点某天即跳月并选中该日

右侧面板
- 「今日 to do」与「待办事项」改成按列高 58/42 平分，列表自身 flex 撑满并可滚动；
  之前待办被挤到底部只剩一条空文案，现在两块都填满整列
- 跳转浮层 z-index 82，压过小屁浮窗（78）；设置遮罩提到 90，保证仍是最高层

AI 助手 → 小屁
- 全屏遮罩 + 右侧整条抽屉删掉，改成右上角 348px 宽浮动小窗：
  可拖动（位置记 localStorage，越界自动夹回视口）、可最小化成小条、双击标题栏切换
- App.jsx 不再因为小屁打开而 inert 主界面（只有设置才是模态），
  所以可以一边让小屁干活一边自己点系统：实测开着窗导航、选日期、填备忘录都正常
- 文案全部改名小屁，顶栏按钮、面板标题、工作台摘要里的引导语一并更新

顺手
- 顶栏搜索的 ⌘K 提示块加 nowrap，1024 宽度下不再折成两行

frontend/src/components/AIAssistant.jsx

@@ -1,25 +1,58 @@
 import React, { useEffect, useMemo, useRef, useState } from 'react'
 import axios from 'axios'
-import { BotIcon, CloseIcon, SendIcon, SparkIcon } from './Icons'
+import { BotIcon, CloseIcon, MinusIcon, SendIcon, SparkIcon } from './Icons'
+
+const POS_KEY = 'happy.aiPos'
+const WIN_WIDTH = 348
 
 const starterMessages = [
-  { role: 'assistant', text: '你好，我是你的供应链 AI 助手。可以帮你查看客户、产品、供应商、订单、商机和待办，也可以协助发起系统内的业务操作。' },
+  { role: 'assistant', text: '我是小屁，你的外贸业务助理。可以帮你查客户、产品、供应商、订单、商机和待办，也能代你发起系统内的操作。' },
 ]
 
+function readStoredPos() {
+  try {
+    const raw = JSON.parse(localStorage.getItem(POS_KEY) || 'null')
+    if (raw && Number.isFinite(raw.left) && Number.isFinite(raw.top)) return { left: raw.left, top: raw.top }
+  } catch { /* 存储不可用时用默认位置 */ }
+  return null
+}
+
+/** 拖动或改窗口大小后，把窗口夹回视口，保证整窗（至少是标题栏）能点到 */
+function clampPos(pos, height) {
+  if (!pos) return pos
+  const maxLeft = Math.max(8, window.innerWidth - WIN_WIDTH - 8)
+  const usable = Math.min(height || 320, window.innerHeight - 60)
+  const maxTop = Math.max(8, window.innerHeight - usable - 8)
+  return {
+    left: Math.min(Math.max(8, pos.left), maxLeft),
+    top: Math.min(Math.max(8, pos.top), maxTop)
+  }
+}
+
+/**
+ * 小屁 —— 右上角浮动小窗。
+ * 不是模态：没有遮罩、不 inert 主界面，所以可以一边让它干活一边自己点系统。
+ */
 function AIAssistant({ isOpen, onClose }) {
   const [messages, setMessages] = useState(starterMessages)
   const [input, setInput] = useState('')
   const [context, setContext] = useState(null)
   const [loading, setLoading] = useState(false)
+  const [minimized, setMinimized] = useState(false)
+  const [pos, setPos] = useState(readStoredPos)
+
   const inputRef = useRef(null)
-  const panelRef = useRef(null)
+  const winRef = useRef(null)
+  const dragRef = useRef(null)
 
   useEffect(() => {
-    if (!isOpen) return
-    inputRef.current?.focus()
-    const onKeyDown = (event) => {
-      if (event.key === 'Escape') onClose()
-    }
+    if (isOpen && !minimized) inputRef.current?.focus()
+  }, [isOpen, minimized])
+
+  // Esc 只收窗，不做任何全局拦截
+  useEffect(() => {
+    if (!isOpen) return undefined
+    const onKeyDown = (event) => { if (event.key === 'Escape') onClose() }
     window.addEventListener('keydown', onKeyDown)
     return () => window.removeEventListener('keydown', onKeyDown)
   }, [isOpen, onClose])
@@ -29,11 +62,41 @@ function AIAssistant({ isOpen, onClose }) {
     axios.get('/api/assistant/context').then(response => setContext(response.data)).catch(() => setContext(null))
   }, [isOpen])
 
+  useEffect(() => {
+    if (!isOpen || !pos) return undefined
+    const onResize = () => setPos(current => clampPos(current, winRef.current?.offsetHeight))
+    window.addEventListener('resize', onResize)
+    return () => window.removeEventListener('resize', onResize)
+  }, [isOpen, pos])
+
+  const onDragStart = (event) => {
+    if (event.target.closest('button')) return
+    const rect = winRef.current?.getBoundingClientRect()
+    if (!rect) return
+    dragRef.current = { dx: event.clientX - rect.left, dy: event.clientY - rect.top }
+    try { event.currentTarget.setPointerCapture(event.pointerId) } catch { /* 合成事件或指针已释放 */ }
+  }
+
+  const onDragMove = (event) => {
+    if (!dragRef.current) return
+    setPos(clampPos({ left: event.clientX - dragRef.current.dx, top: event.clientY - dragRef.current.dy }, winRef.current?.offsetHeight))
+  }
+
+  const onDragEnd = (event) => {
+    if (!dragRef.current) return
+    dragRef.current = null
+    try { event.currentTarget.releasePointerCapture(event.pointerId) } catch { /* 指针已释放 */ }
+    const rect = winRef.current?.getBoundingClientRect()
+    if (rect) {
+      try { localStorage.setItem(POS_KEY, JSON.stringify({ left: rect.left, top: rect.top })) } catch { /* 仅本次会话 */ }
+    }
+  }
+
   const capabilities = useMemo(() => [
     '读取全局业务概览与实时统计',
     '检索客户、供应商、产品和订单',
     '查看商机、待办与近期活动',
-    '发起已授权的新增、更新和状态操作',
+    '发起已授权的新增、更新和状态操作'
   ], [])
 
   if (!isOpen) return null
@@ -56,29 +119,60 @@ function AIAssistant({ isOpen, onClose }) {
   }
 
   return (
-    <div className="assistant-layer" onClick={onClose}>
-      <aside ref={panelRef} className="ai-assistant-panel" role="dialog" aria-modal="true" aria-labelledby="ai-assistant-title" onClick={event => event.stopPropagation()}>
-        <div className="ai-panel-header">
-          <div className="ai-panel-title"><span className="ai-orb"><BotIcon size={20} /></span><div><span className="section-label">[SYSTEM COPILOT]</span><h2 id="ai-assistant-title">AI 助手</h2></div></div>
-          <button className="ai-close-btn" onClick={onClose} aria-label="关闭 AI 助手"><CloseIcon size={18} /></button>
+    <aside
+      ref={winRef}
+      className={`ai-window${minimized ? ' is-minimized' : ''}`}
+      style={pos ? { left: pos.left, top: pos.top, right: 'auto' } : undefined}
+      role="complementary"
+      aria-labelledby="ai-assistant-title"
+    >
+      <div
+        className="ai-window-bar"
+        onPointerDown={onDragStart}
+        onPointerMove={onDragMove}
+        onPointerUp={onDragEnd}
+        onPointerCancel={onDragEnd}
+        onDoubleClick={() => setMinimized(value => !value)}
+      >
+        <div className="ai-panel-title">
+          <span className="ai-orb"><BotIcon size={16} /></span>
+          <div><span className="section-label">[COPILOT]</span><h2 id="ai-assistant-title">小屁</h2></div>
         </div>
+        <div className="ai-window-actions">
+          {!minimized && <span className="ai-live-dot" title="已连接系统业务层" />}
+          <button
+            type="button"
+            className="ai-icon-btn"
+            onClick={() => setMinimized(value => !value)}
+            aria-label={minimized ? '展开小屁' : '最小化小屁'}
+            title={minimized ? '展开' : '最小化（也可以双击标题栏）'}
+          >
+            {minimized ? <SparkIcon size={15} /> : <MinusIcon size={16} />}
+          </button>
+          <button type="button" className="ai-icon-btn" onClick={onClose} aria-label="关闭小屁" title="关闭">
+            <CloseIcon size={15} />
+          </button>
+        </div>
+      </div>
 
-        <div className="ai-access-banner"><span className="ai-live-dot" /><div><strong>已连接系统业务层</strong><small>可读取模块数据，敏感写操作会先请求确认</small></div></div>
-
-        <div className="ai-panel-body">
-          <div className="ai-capability-card"><div className="ai-capability-heading"><SparkIcon size={15} />我能帮你</div>{capabilities.map(capability => <div className="ai-capability-row" key={capability}><span>✓</span>{capability}</div>)}</div>
-          {context && <div className="ai-context-strip"><span>当前数据快照</span><b>{context.stats?.customers || 0} 客户</b><b>{context.stats?.products || 0} 产品</b><b>{context.stats?.orders || 0} 订单</b></div>}
-          <div className="ai-message-list">
-            {messages.map((message, index) => <div className={`ai-message ${message.role}`} key={`${message.role}-${index}`}><div className="ai-message-avatar">{message.role === 'assistant' ? <BotIcon size={15} /> : 'W'}</div><div className="ai-message-content"><p>{message.text}</p>{message.meta && <small>{message.meta}</small>}</div></div>)}
-            {loading && <div className="ai-message assistant"><div className="ai-message-avatar"><BotIcon size={15} /></div><div className="ai-message-content ai-thinking"><span /><span /><span /></div></div>}
+      {!minimized && (
+        <React.Fragment>
+          <div className="ai-panel-body">
+            <div className="ai-access-banner"><span className="ai-live-dot" /><div><strong>已连接系统业务层</strong><small>可读取模块数据，敏感写操作会先请求确认</small></div></div>
+            <div className="ai-capability-card"><div className="ai-capability-heading"><SparkIcon size={15} />我能帮你</div>{capabilities.map(capability => <div className="ai-capability-row" key={capability}><span>✓</span>{capability}</div>)}</div>
+            {context && <div className="ai-context-strip"><span>当前数据快照</span><b>{context.stats?.customers || 0} 客户</b><b>{context.stats?.products || 0} 产品</b><b>{context.stats?.orders || 0} 订单</b></div>}
+            <div className="ai-message-list">
+              {messages.map((message, index) => <div className={`ai-message ${message.role}`} key={`${message.role}-${index}`}><div className="ai-message-avatar">{message.role === 'assistant' ? <BotIcon size={15} /> : 'W'}</div><div className="ai-message-content"><p>{message.text}</p>{message.meta && <small>{message.meta}</small>}</div></div>)}
+              {loading && <div className="ai-message assistant"><div className="ai-message-avatar"><BotIcon size={15} /></div><div className="ai-message-content ai-thinking"><span /><span /><span /></div></div>}
+            </div>
           </div>
-        </div>
 
-        <div className="ai-suggestion-row"><button onClick={() => sendMessage('汇总今天最重要的事项')}>汇总今天事项</button><button onClick={() => sendMessage('查看系统数据概览')}>查看系统概览</button></div>
-        <form className="ai-input-row" onSubmit={event => { event.preventDefault(); sendMessage() }}><input ref={inputRef} value={input} onChange={event => setInput(event.target.value)} placeholder="告诉 AI 你要查什么或做什么…" aria-label="输入给 AI 助手的内容" /><button type="submit" disabled={!input.trim() || loading} aria-label="发送"><SendIcon size={18} /></button></form>
-        <div className="ai-panel-footer">AI 会先说明将要执行的操作，再进行需要写入数据的动作。</div>
-      </aside>
-    </div>
+          <div className="ai-suggestion-row"><button onClick={() => sendMessage('汇总今天最重要的事项')}>汇总今天事项</button><button onClick={() => sendMessage('查看系统数据概览')}>查看系统概览</button></div>
+          <form className="ai-input-row" onSubmit={event => { event.preventDefault(); sendMessage() }}><input ref={inputRef} value={input} onChange={event => setInput(event.target.value)} placeholder="告诉小屁你要查什么或做什么…" aria-label="输入给小屁的内容" /><button type="submit" disabled={!input.trim() || loading} aria-label="发送"><SendIcon size={18} /></button></form>
+          <div className="ai-panel-footer">小屁会先说明将要执行的操作，再进行需要写入数据的动作。</div>
+        </React.Fragment>
+      )}
+    </aside>
   )
 }
 

frontend/src/components/GlobalHeader.jsx

@@ -116,7 +116,7 @@ function GlobalHeader({ onOpenAssistant }) {
           )
         })}
       </nav>
-      <div className="global-header-actions"><TimeZoneClock now={now} /><FxCalculator /><button className="quick-create-btn" title="快速新建"><PlusCircleIcon size={19} /><span>快速新建</span></button><button className="ai-entry-btn" onClick={onOpenAssistant} title="打开 AI 助手"><BotIcon size={19} /><span>AI 助手</span><i>β</i></button><button className="header-avatar" title="当前用户">W</button><button className="mobile-search-btn" onClick={() => { setSearchOpen(v => !v); window.setTimeout(() => searchRef.current?.focus(), 0) }} title="搜索"><SearchIcon size={18} /></button></div>
+      <div className="global-header-actions"><TimeZoneClock now={now} /><FxCalculator /><button className="quick-create-btn" title="快速新建"><PlusCircleIcon size={19} /><span>快速新建</span></button><button className="ai-entry-btn" onClick={onOpenAssistant} title="打开小屁"><BotIcon size={19} /><span>小屁</span><i>β</i></button><button className="header-avatar" title="当前用户">W</button><button className="mobile-search-btn" onClick={() => { setSearchOpen(v => !v); window.setTimeout(() => searchRef.current?.focus(), 0) }} title="搜索"><SearchIcon size={18} /></button></div>
     </header>
   )
 }

frontend/src/components/Icons.jsx

@@ -118,6 +118,12 @@ export const CalendarIcon = ({ size = 20, className = '' }) => (
   </svg>
 )
 
+export const MinusIcon = ({ size = 20, className = '' }) => (
+  <svg width={size} height={size} viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className={className} aria-hidden="true">
+    <line x1="5" y1="12" x2="19" y2="12" />
+  </svg>
+)
+
 export const BellIcon = ({ size = 20, className = '' }) => (
   <svg width={size} height={size} viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className={className}>
     <path d="M18 8A6 6 0 0 0 6 8c0 7-3 9-3 9h18s-3-2-3-9" />