feat(V0.2): 快速添加输入框三行/失焦收起; ⋯菜单点选即收; 项目图标可设图片

- 快速添加改 3 行 textarea, Enter 创建/Shift+Enter 换行/Esc 关闭,
  焦点离开且无内容时自动收起
- 任务 ⋯ ActionSheet 点选动作后 handler.close() 收回菜单
- Project.icon (TEXT data URL, 迁移 20261025130000): 项目管理可选图片,
  客户端裁为 96x96 cover JPEG (~15KB); 项目列表/最近项目/管理页图标位
  显示图片, 保持原尺寸与圆角; 可恢复默认首字色块

src/pages/task/ProjectManage.jsx

@@ -1,4 +1,4 @@
-import { useState } from 'react'
+import { useRef, useState } from 'react'
 import { Dialog, Input, Popup, Toast } from 'antd-mobile'
 import { projectApi } from '../../api/task.js'
 import { useAuth } from '../../auth/AuthContext.jsx'
@@ -21,6 +21,8 @@ export default function ProjectManage({ project, onClose, onChanged, onExited })
   const [kindEdit, setKindEdit] = useState(false)
   const [kinds, setKinds] = useState([])
   const [newKind, setNewKind] = useState('')
+  // 项目图标更换: 隐藏 file input
+  const iconInputRef = useRef(null)
 
   const members = project.members || []
   const notes = Array.isArray(project.notes) ? project.notes : []
@@ -149,6 +151,49 @@ export default function ProjectManage({ project, onClose, onChanged, onExited })
     }
   }
 
+  // 项目图标: 图片裁为 96x96 cover JPEG data URL (保持现有尺寸/圆角由 CSS 承担)
+  function pickIcon() { iconInputRef.current?.click() }
+
+  function onIconFile(e) {
+    const file = e.target.files?.[0]
+    e.target.value = ''
+    if (!file || !file.type.startsWith('image/')) return
+    const url = URL.createObjectURL(file)
+    const img = new Image()
+    img.onload = async () => {
+      URL.revokeObjectURL(url)
+      const S = 96
+      const c = document.createElement('canvas')
+      c.width = S
+      c.height = S
+      const ctx = c.getContext('2d')
+      const r = Math.max(S / img.width, S / img.height)
+      const w = img.width * r
+      const h = img.height * r
+      ctx.drawImage(img, (S - w) / 2, (S - h) / 2, w, h)
+      const dataUrl = c.toDataURL('image/jpeg', 0.85)
+      try {
+        await projectApi.update(project.id, { icon: dataUrl })
+        Toast.show({ content: '图标已更新' })
+        onChanged?.()
+      } catch (err) {
+        Toast.show({ content: err.message || '图标保存失败' })
+      }
+    }
+    img.onerror = () => URL.revokeObjectURL(url)
+    img.src = url
+  }
+
+  async function clearIcon() {
+    try {
+      await projectApi.update(project.id, { icon: null })
+      Toast.show({ content: '已恢复默认' })
+      onChanged?.()
+    } catch (e) {
+      Toast.show({ content: e.message })
+    }
+  }
+
   async function quit() {    const ok = await Dialog.confirm({
       content: '退出该项目？退出后将不再可见。',
       confirmText: '退出',
@@ -222,6 +267,23 @@ export default function ProjectManage({ project, onClose, onChanged, onExited })
         </div>
 
         <div className="section-h" style={{ margin: '14px 14px 8px' }}>项目信息</div>
+        <div className="set-row" style={{ padding: '12px 14px' }}>
+          <span className="pn" style={{ flex: 1, fontSize: 13.5 }}>项目图标</span>
+          <div
+            className="pico"
+            style={{
+              width: 34, height: 34, borderRadius: 9, flexShrink: 0,
+              background: project.icon ? `url(${project.icon}) center/cover no-repeat` : '#dfe6f0',
+              color: '#5a6a80', cursor: 'pointer',
+            }}
+            onClick={pickIcon}
+          >
+            {project.icon ? '' : (project.name || '?').slice(0, 1)}
+          </div>
+          {project.icon && <span className="link" style={{ marginLeft: 10 }} onClick={clearIcon}>恢复</span>}
+          <span className="link" style={{ marginLeft: 10 }} onClick={pickIcon}>更换</span>
+          <input ref={iconInputRef} type="file" accept="image/*" hidden onChange={onIconFile} />
+        </div>
         <div className="set-row" style={{ padding: '12px 14px' }} onClick={() => { setName(project.name); setRenaming(true) }}>
           <span className="pn" style={{ flex: 1, fontSize: 13.5 }}>项目名称</span>
           <span style={{ fontSize: 12.5, color: '#999' }}>{project.name}</span>