fix: restore current page after refresh

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

@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest'
-import { calendarModeLabel, clampFabPosition, countdownDayText, countdownKindLabel, dateKey, defaultView, habitButtonNotice, habitButtonValue, habitWeek, isFabDrag, isHabitComplete, isHabitScheduledToday, isTaskView, nextHabitSwipeValue, nextTotalAfterLocalTaskAdd, numericHabitInputValue, previousHabitSwipeValue, quickTaskFields, readCountdownCache, readHabitGridCache, readStoredBoolean, shouldToggleRowSwipe, writeCountdownCache, writeHabitGridCache, writeStoredBoolean } from './mvp-utils'
+import { calendarModeLabel, clampFabPosition, countdownDayText, countdownKindLabel, dateKey, defaultView, habitButtonNotice, habitButtonValue, habitWeek, isFabDrag, isHabitComplete, isHabitScheduledToday, isTaskView, nextHabitSwipeValue, nextTotalAfterLocalTaskAdd, numericHabitInputValue, previousHabitSwipeValue, quickTaskFields, readCountdownCache, readHabitGridCache, readStoredBoolean, readStoredNavigation, shouldToggleRowSwipe, writeCountdownCache, writeHabitGridCache, writeStoredBoolean, writeStoredNavigation } from './mvp-utils'
 
 describe('MVP view utilities', () => {
   it('formats a local date as YYYY-MM-DD', () => {
@@ -17,6 +17,19 @@ describe('MVP view utilities', () => {
     expect(['habits', 'settings', 'trash'].filter(isTaskView)).toEqual([])
   })
 
+  it('restores the last page and selected task list after refresh', () => {
+    const storage = new Map<string, string>()
+    const fakeStorage = {
+      getItem: (key: string) => storage.get(key) ?? null,
+      setItem: (key: string, value: string) => storage.set(key, value),
+    }
+    expect(readStoredNavigation(fakeStorage, 'dodo.navigation')).toEqual({ view: 'today', listId: '' })
+    writeStoredNavigation(fakeStorage, 'dodo.navigation', 'tasks', 'list-2')
+    expect(readStoredNavigation(fakeStorage, 'dodo.navigation')).toEqual({ view: 'tasks', listId: 'list-2' })
+    storage.set('dodo.navigation', JSON.stringify({ view: 'invalid', listId: 'list-2' }))
+    expect(readStoredNavigation(fakeStorage, 'dodo.navigation')).toEqual({ view: 'today', listId: '' })
+  })
+
   it('only completes numeric habits when progress reaches the target', () => {
     expect(isHabitComplete('numeric', 3, 5)).toBe(false)
     expect(isHabitComplete('numeric', 5, 5)).toBe(true)

frontend/src/lib/mvp-utils.ts

@@ -1,4 +1,21 @@
 type BooleanStorage = Pick<Storage, 'getItem' | 'setItem'>
+type NavigationView = 'tasks' | 'today' | 'upcoming' | 'trash' | 'habits' | 'countdowns' | 'settings'
+type StoredNavigation = { view: NavigationView; listId: string }
+const NAVIGATION_VIEWS = new Set<NavigationView>(['tasks', 'today', 'upcoming', 'trash', 'habits', 'countdowns', 'settings'])
+
+export function readStoredNavigation(storage: BooleanStorage, key: string): StoredNavigation {
+  try {
+    const value = JSON.parse(storage.getItem(key) ?? 'null')
+    if (value && NAVIGATION_VIEWS.has(value.view) && typeof value.listId === 'string') {
+      return { view: value.view, listId: value.listId }
+    }
+  } catch { /* storage may be unavailable or invalid */ }
+  return { view: defaultView(), listId: '' }
+}
+
+export function writeStoredNavigation(storage: BooleanStorage, key: string, view: NavigationView, listId: string) {
+  try { storage.setItem(key, JSON.stringify({ view, listId })) } catch { /* storage may be unavailable */ }
+}
 
 export function readStoredBoolean(storage: BooleanStorage, key: string, fallback: boolean) {
   try {