feat: remove calendar and refine habits

frontend/src/lib/mvp-utils.ts

@@ -5,26 +5,6 @@ export function dateKey(date: Date) {
   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))
@@ -43,3 +23,14 @@ export function mergePage<T>(page: T[] | { items?: T[]; next_cursor?: string | n
 export function isTaskView(view: string) {
   return view === 'tasks' || view === 'today' || view === 'upcoming'
 }
+
+export function isHabitComplete(kind: string | undefined, value: number | boolean | undefined, target = 1) {
+  if (kind === 'numeric') return Number(value ?? 0) >= target
+  return Boolean(value)
+}
+
+export function numericHabitInputValue(input: number | string | undefined) {
+  if (input === undefined || input === '') return null
+  const value = Number(input)
+  return Number.isFinite(value) && value >= 0 ? value : null
+}