feat(V0.2): 列表拖动修复 + 打卡项组内拖动排序

- 任务列表/看板拖动: 激活后用非 passive touchmove preventDefault 拦截浏览器滚动接管, 修复列表长按抬起后 pointercancel 导致无法真正拖动
- 打卡: 列表按周期分组展示(每天/每周/每月/每年), 长按拖动组内排序(上下落点指示), 新增 POST /checkin/habits/reorder 重写 sortOrder; 新建项排到末尾
- 打卡卡片加 touch-action/user-select 防长按误触; 拖动结束 350ms 内抑制点击余波

src/components/task/useColumnDrag.js

@@ -99,6 +99,8 @@ export default function useColumnDrag({ onDrop, scrollSelector = '.board-wrap' }
       try { ev.currentTarget.setPointerCapture(ev.pointerId) } catch { /* ignore */ }
       const el = ev.currentTarget
       const move = (e2) => onPointerMove(e2)
+      // 激活后拦截触摸滚动: 防纵向分量触发浏览器接管 (pointercancel), 同 useRowDrag
+      const tm = (e2) => { if (st.current.active) e2.preventDefault() }
       const up = (e2) => { onPointerUp(e2); detach() }
       const cancel = () => {
         if (st.current.active) lastEnd.current = Date.now()
@@ -109,10 +111,12 @@ export default function useColumnDrag({ onDrop, scrollSelector = '.board-wrap' }
         el.removeEventListener('pointermove', move)
         el.removeEventListener('pointerup', up)
         el.removeEventListener('pointercancel', cancel)
+        el.removeEventListener('touchmove', tm)
       }
       el.addEventListener('pointermove', move)
       el.addEventListener('pointerup', up)
       el.addEventListener('pointercancel', cancel)
+      el.addEventListener('touchmove', tm, { passive: false })
     },
     // 长按不弹系统菜单 (配合 CSS user-select:none, 防长按变文字选择)
     onContextMenu: (ev) => ev.preventDefault(),