feat: collapse Today sections

frontend/src/lib/today-section-collapse.test.ts

@@ -0,0 +1,43 @@
+import { describe, expect, it } from 'vitest'
+import { readTodaySectionCollapse, writeTodaySectionCollapse } from './today-section-collapse'
+
+const defaults = { overdue: false, tasks: false, habits: false }
+
+function fakeStorage(initial?: string) {
+  const values = new Map<string, string>()
+  if (initial !== undefined) values.set('dodo.today-section-collapse.v1', initial)
+  return {
+    getItem: (key: string) => values.get(key) ?? null,
+    setItem: (key: string, value: string) => values.set(key, value),
+    value: () => values.get('dodo.today-section-collapse.v1'),
+  }
+}
+
+describe('Today section collapse persistence', () => {
+  it('defaults every section to expanded when storage is absent or malformed', () => {
+    expect(readTodaySectionCollapse(fakeStorage(), 'dodo.today-section-collapse.v1')).toEqual(defaults)
+    expect(readTodaySectionCollapse(fakeStorage('{bad'), 'dodo.today-section-collapse.v1')).toEqual(defaults)
+  })
+
+  it('accepts only boolean fields and falls back invalid or missing fields independently', () => {
+    expect(readTodaySectionCollapse(fakeStorage(JSON.stringify({ overdue: true, tasks: 'yes', extra: true })), 'dodo.today-section-collapse.v1')).toEqual({
+      overdue: true,
+      tasks: false,
+      habits: false,
+    })
+  })
+
+  it('does not break collapsing when storage rejects a write', () => {
+    const storage = {
+      getItem: () => null,
+      setItem: () => { throw new Error('quota exceeded') },
+    }
+    expect(() => writeTodaySectionCollapse(storage, 'dodo.today-section-collapse.v1', defaults)).not.toThrow()
+  })
+
+  it('writes all three independent section states under the single versioned key', () => {
+    const storage = fakeStorage()
+    writeTodaySectionCollapse(storage, 'dodo.today-section-collapse.v1', { overdue: true, tasks: false, habits: true })
+    expect(storage.value()).toBe(JSON.stringify({ overdue: true, tasks: false, habits: true }))
+  })
+})

frontend/src/lib/today-section-collapse.ts

@@ -0,0 +1,30 @@
+export type TodaySectionCollapse = {
+  overdue: boolean
+  tasks: boolean
+  habits: boolean
+}
+
+type StorageLike = Pick<Storage, 'getItem' | 'setItem'>
+
+const expandedDefaults = (): TodaySectionCollapse => ({ overdue: false, tasks: false, habits: false })
+
+export function readTodaySectionCollapse(storage: StorageLike, key: string): TodaySectionCollapse {
+  try {
+    const parsed = JSON.parse(storage.getItem(key) ?? '') as Partial<Record<keyof TodaySectionCollapse, unknown>>
+    return {
+      overdue: typeof parsed.overdue === 'boolean' ? parsed.overdue : false,
+      tasks: typeof parsed.tasks === 'boolean' ? parsed.tasks : false,
+      habits: typeof parsed.habits === 'boolean' ? parsed.habits : false,
+    }
+  } catch {
+    return expandedDefaults()
+  }
+}
+
+export function writeTodaySectionCollapse(storage: StorageLike, key: string, value: TodaySectionCollapse) {
+  try {
+    storage.setItem(key, JSON.stringify(value))
+  } catch {
+    // Storage can be unavailable (privacy mode/quota); collapsing must still work in memory.
+  }
+}