fix(ui): show 'now' for idle OpenAI usage windows

Use utilization-based idle detection instead of local request counts so newly imported OAuth accounts keep countdowns when usage is non-zero.

frontend/src/components/account/AccountUsageCell.vue

@@ -82,6 +82,7 @@
           :utilization="usageInfo.five_hour.utilization"
           :resets-at="usageInfo.five_hour.resets_at"
           :window-stats="usageInfo.five_hour.window_stats"
+          :show-now-when-idle="true"
           color="indigo"
         />
         <UsageProgressBar
@@ -90,6 +91,7 @@
           :utilization="usageInfo.seven_day.utilization"
           :resets-at="usageInfo.seven_day.resets_at"
           :window-stats="usageInfo.seven_day.window_stats"
+          :show-now-when-idle="true"
           color="emerald"
         />
       </div>

frontend/src/components/account/UsageProgressBar.vue

@@ -48,7 +48,7 @@
       </span>
 
       <!-- Reset time -->
-      <span v-if="resetsAt" class="shrink-0 text-[10px] text-gray-400">
+      <span v-if="shouldShowResetTime" class="shrink-0 text-[10px] text-gray-400">
         {{ formatResetTime }}
       </span>
     </div>
@@ -68,6 +68,7 @@ const props = defineProps<{
   resetsAt?: string | null
   color: 'indigo' | 'emerald' | 'purple' | 'amber'
   windowStats?: WindowStats | null
+  showNowWhenIdle?: boolean
 }>()
 
 const { t } = useI18n()
@@ -139,9 +140,20 @@ const displayPercent = computed(() => {
   return percent > 999 ? '>999%' : `${percent}%`
 })
 
+const shouldShowResetTime = computed(() => {
+  if (props.resetsAt) return true
+  return Boolean(props.showNowWhenIdle && props.utilization <= 0)
+})
+
 // Format reset time
 const formatResetTime = computed(() => {
+  // For rolling windows, when utilization is 0%, treat as immediately available.
+  if (props.showNowWhenIdle && props.utilization <= 0) {
+    return '现在'
+  }
+
   if (!props.resetsAt) return '-'
+
   const date = new Date(props.resetsAt)
   const diffMs = date.getTime() - now.value.getTime()
 

frontend/src/components/account/__tests__/UsageProgressBar.spec.ts

@@ -0,0 +1,69 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { mount } from '@vue/test-utils'
+import UsageProgressBar from '../UsageProgressBar.vue'
+
+vi.mock('vue-i18n', async () => {
+  const actual = await vi.importActual<typeof import('vue-i18n')>('vue-i18n')
+  return {
+    ...actual,
+    useI18n: () => ({
+      t: (key: string) => key
+    })
+  }
+})
+
+describe('UsageProgressBar', () => {
+  beforeEach(() => {
+    vi.useFakeTimers()
+    vi.setSystemTime(new Date('2026-03-17T00:00:00Z'))
+  })
+
+  afterEach(() => {
+    vi.useRealTimers()
+  })
+
+  it('showNowWhenIdle=true 且利用率为 0 时显示“现在”', () => {
+    const wrapper = mount(UsageProgressBar, {
+      props: {
+        label: '5h',
+        utilization: 0,
+        resetsAt: '2026-03-17T02:30:00Z',
+        showNowWhenIdle: true,
+        color: 'indigo'
+      }
+    })
+
+    expect(wrapper.text()).toContain('现在')
+    expect(wrapper.text()).not.toContain('2h 30m')
+  })
+
+  it('showNowWhenIdle=true 但利用率大于 0 时显示倒计时', () => {
+    const wrapper = mount(UsageProgressBar, {
+      props: {
+        label: '7d',
+        utilization: 12,
+        resetsAt: '2026-03-17T02:30:00Z',
+        showNowWhenIdle: true,
+        color: 'emerald'
+      }
+    })
+
+    expect(wrapper.text()).toContain('2h 30m')
+    expect(wrapper.text()).not.toContain('现在')
+  })
+
+  it('showNowWhenIdle=false 时保持原有倒计时行为', () => {
+    const wrapper = mount(UsageProgressBar, {
+      props: {
+        label: '1d',
+        utilization: 0,
+        resetsAt: '2026-03-17T02:30:00Z',
+        showNowWhenIdle: false,
+        color: 'indigo'
+      }
+    })
+
+    expect(wrapper.text()).toContain('2h 30m')
+    expect(wrapper.text()).not.toContain('现在')
+  })
+})