feat: redesign habit detail paper flow

frontend/src/lib/mvp-utils.ts

@@ -107,6 +107,63 @@ export function formatHabitHistoryNumber(value: number) {
   return Number.isInteger(value) ? String(value) : String(Number(value.toFixed(6)))
 }
 
+type HabitDetailFields = {
+  kind?: string
+  target?: number
+  unit?: string
+  archived_at?: string | null
+  schedule_type?: 'daily' | 'weekly' | 'monthly' | 'interval'
+  weekdays?: number[] | null
+  month_days?: number[] | null
+  interval_days?: number | null
+}
+
+export function formatHabitRecordMode(habit: HabitDetailFields) {
+  if (habit.kind !== 'numeric') return '完成 / 未完成'
+  const unit = habit.unit ? ` ${habit.unit}` : ''
+  return `按数量记录 · 目标 ${formatHabitHistoryNumber(habit.target ?? 1)}${unit}`
+}
+
+export function formatHabitSchedule(habit: HabitDetailFields) {
+  if (habit.schedule_type === 'weekly') {
+    const weekdays = habit.weekdays ?? []
+    if (!weekdays.length) return '每周（日期未设置）'
+    const labels = ['一', '二', '三', '四', '五', '六', '日']
+    return `每${weekdays.map((day) => `周${labels[day] ?? day}`).join('、')}`
+  }
+  if (habit.schedule_type === 'monthly') {
+    const monthDays = habit.month_days ?? []
+    return monthDays.length ? `每月 ${monthDays.join('、')} 日` : '每月（日期未设置）'
+  }
+  if (habit.schedule_type === 'interval') {
+    return habit.interval_days ? `每 ${habit.interval_days} 天` : '按间隔（天数未设置）'
+  }
+  return '每天'
+}
+
+export function formatHabitDetailDate(day?: string) {
+  if (!day) return '未提供'
+  const [year, month, date] = day.split('-').map(Number)
+  if (!year || !month || !date) return day
+  return `${year}年${month}月${date}日`
+}
+
+export function formatHabitDetailProgress(habit: Pick<HabitDetailFields, 'kind' | 'target' | 'unit' | 'archived_at'> & { value?: number | boolean }) {
+  if (habit.archived_at) return null
+  const target = habit.target ?? 1
+  const value = Number(habit.value ?? 0)
+  if (habit.kind !== 'numeric') {
+    const complete = Boolean(habit.value)
+    return { primary: complete ? '已完成' : '未完成', note: complete ? '今日目标已达成' : '今天尚未完成', semantic: complete ? '已完成' : '未完成' }
+  }
+  const complete = value >= target
+  return {
+    primary: `${formatHabitHistoryNumber(value)} / ${formatHabitHistoryNumber(target)}`,
+    note: complete ? '今日目标已达成' : `今天还差 ${formatHabitHistoryNumber(Math.max(0, target - value))}${habit.unit ? ` ${habit.unit}` : ''}`,
+    semantic: complete ? '已达标' : `${Math.round(target > 0 ? value / target * 100 : 0)}%`,
+  }
+}
+
 type HabitSchedule = {
   kind?: string
   cells?: Array<{ day: string; scheduled?: boolean; paused?: boolean; value?: number | boolean }>