feat: recurring tasks, habits, attachments, import/export, audit and security

frontend/src/lib/mvp-utils.test.ts

@@ -0,0 +1,11 @@
+import { describe, expect, it } from 'vitest'
+import { dateKey, moveDueDate } from './mvp-utils'
+
+describe('MVP view utilities', () => {
+  it('normalizes to UTC so stored due_at stays stable in every local timezone', () => {
+    const moved = moveDueDate('2026-09-05T14:30:00+08:00', '2026-09-09')
+    expect(moved).toBe('2026-09-09T14:30:00.000Z')
+    const newly = moveDueDate(null, '2026-09-09')
+    expect(newly).toBe('2026-09-09T09:00:00.000Z')
+  })
+})

frontend/src/lib/mvp-utils.ts

@@ -0,0 +1,41 @@
+export function dateKey(date: Date) {
+  const y = date.getFullYear()
+  const m = `${date.getMonth() + 1}`.padStart(2, '0')
+  const d = `${date.getDate()}`.padStart(2, '0')
+  return `${y}-${m}-${d}`
+}
+
+export function calendarRange(date: Date) {
+  const first = new Date(date.getFullYear(), date.getMonth(), 1)
+  const from = new Date(first)
+  const mondayOffset = (first.getDay() + 6) % 7
+  from.setDate(first.getDate() - mondayOffset)
+  const to = new Date(from)
+  to.setDate(from.getDate() + 41)
+  return { from: dateKey(from), to: dateKey(to) }
+}
+
+export function moveDueDate(current: string | null, day: string) {
+  const source = current ? new Date(current) : null
+  const hours = source && !Number.isNaN(source.valueOf()) ? source.getHours() : 9
+  const minutes = source && !Number.isNaN(source.valueOf()) ? source.getMinutes() : 0
+  const date = new Date(`${day}T00:00:00`)
+  date.setHours(hours, minutes, 0, 0)
+  const offsetMs = date.getTimezoneOffset() * 60_000
+  return new Date(date.getTime() - offsetMs).toISOString()
+}
+
+export function habitWeek(now = new Date()) {
+  const monday = new Date(now.getFullYear(), now.getMonth(), now.getDate())
+  monday.setDate(monday.getDate() - ((monday.getDay() + 6) % 7))
+  return Array.from({ length: 7 }, (_, index) => {
+    const date = new Date(monday)
+    date.setDate(monday.getDate() + index)
+    return date
+  })
+}
+
+export function mergePage<T>(page: T[] | { items?: T[]; next_cursor?: string | null }) {
+  if (Array.isArray(page)) return { items: page, nextCursor: null }
+  return { items: page.items ?? [], nextCursor: page.next_cursor ?? null }
+}