fix(ui): discard unapplied date ranges on dismissal

frontend/src/components/common/DateRangePicker.vue

@@ -290,6 +290,14 @@ const handleEscape = (event: KeyboardEvent) => {
   }
 }
 
+// Restore the applied range after dismissal, including parent updates from Apply.
+watch(isOpen, (open) => {
+  if (open) return
+  localStartDate.value = props.startDate
+  localEndDate.value = props.endDate
+  onDateChange()
+}, { flush: 'post' })
+
 // Sync local state with props
 watch(
   () => props.startDate,

frontend/src/components/common/__tests__/DateRangePicker.dismiss.spec.ts

@@ -0,0 +1,47 @@
+import { mount } from '@vue/test-utils'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { nextTick, ref } from 'vue'
+import DateRangePicker from '../DateRangePicker.vue'
+
+vi.mock('vue-i18n', () => ({ useI18n: () => ({ t: (key: string) => key, locale: ref('en') }) }))
+let wrapper: ReturnType<typeof mount<typeof DateRangePicker>>
+beforeEach(() => { vi.useFakeTimers(); vi.setSystemTime(new Date(2026, 8, 13, 12)) })
+afterEach(() => { wrapper?.unmount(); vi.useRealTimers() })
+
+async function chooseDraft() {
+  wrapper = mount(DateRangePicker, {
+    props: {
+      startDate: '2026-09-13', endDate: '2026-09-13',
+      'onUpdate:startDate': (startDate: string) => { void wrapper.setProps({ startDate }) },
+      'onUpdate:endDate': (endDate: string) => { void wrapper.setProps({ endDate }) },
+    },
+  })
+  await wrapper.get('.date-picker-trigger').trigger('click')
+  await wrapper.findAll('.date-picker-preset').find(node => node.text() === 'dates.last7Days')!.trigger('click')
+}
+
+describe('DateRangePicker unapplied changes', () => {
+  it.each(['outside', 'escape', 'toggle'])('discards draft dates when dismissed with %s', async (method) => {
+    await chooseDraft()
+    if (method === 'outside') document.body.click()
+    else if (method === 'escape') document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape' }))
+    else await wrapper.get('.date-picker-trigger').trigger('click')
+    await nextTick()
+    expect(wrapper.emitted('change')).toBeUndefined()
+    expect(wrapper.get('.date-picker-trigger').text()).toContain('dates.today')
+    await wrapper.get('.date-picker-trigger').trigger('click')
+    expect(wrapper.findAll<HTMLInputElement>('input[type="date"]').map(input => input.element.value))
+      .toEqual(['2026-09-13', '2026-09-13'])
+  })
+
+  it('retains a newly applied range after the parent accepts both updates', async () => {
+    await chooseDraft()
+    await wrapper.get('.date-picker-apply').trigger('click')
+    await nextTick()
+    expect(wrapper.emitted('change')).toEqual([[{ startDate: '2026-09-07', endDate: '2026-09-13', preset: '7days' }]])
+    expect(wrapper.get('.date-picker-trigger').text()).toContain('dates.last7Days')
+    await wrapper.get('.date-picker-trigger').trigger('click')
+    expect(wrapper.findAll<HTMLInputElement>('input[type="date"]').map(input => input.element.value))
+      .toEqual(['2026-09-07', '2026-09-13'])
+  })
+})