feat: 今天环境条新增下一个倒数日、浙江油价、上证指数、降雨/AQI

- 后端新增三源：中石化浙江油价(3步会话)、新浪上证行情、Open-Meteo 空气质量(国标AQI换算)，按源独立超时与状态
- 天气行改为 降雨概率% · AQI 等级（无雨无AQI时保留观测时间），stale 补缓存标记
- 前端 strip 六格两行(桌面)/四行(移动)，倒数日取本地缓存最近一条，超12字截断
- 修复两处 AppSheet 动画竞态存量 e2e 失败(modal contract footer 时序、scrollable 重开残留 dialog)

frontend/e2e/mobile-ui.spec.ts

@@ -59,6 +59,8 @@ test('desktop task composer stays compact, centered, and scrollable on short scr
   expect(metrics.footerBottom).toBeLessThanOrEqual(metrics.viewport.height + 1)
 
   await page.keyboard.press('Escape')
+  // AppSheet 关闭有 160ms leave 动画，等旧 dialog 完全移除再重开（否则 strict mode 命中残留按钮）
+  await expect(page.getByRole('dialog', { name: /添加(?:今天)?任务/ })).toHaveCount(0)
   await page.setViewportSize({ width: 930, height: 844 })
   dialog = await openTaskComposer(page)
   const mobile = await dialog.evaluate(element => {
@@ -346,6 +348,11 @@ test('task, habit, countdown, memo, action and confirmation overlays share the m
   const assertModal = async (dialog: ReturnType<Page['getByRole']>) => {
     await expect(dialog).toBeVisible()
     await expect(page.locator('#app')).toHaveAttribute('inert', '')
+    const footer = dialog.locator('.app-sheet__footer, footer').first()
+    if (await footer.count()) {
+      // AppSheet 打开有 210ms 滑入动画，先等 footer 落位再测量（否则测在动画中途）
+      await expect.poll(async () => footer.evaluate(element => element.getBoundingClientRect().bottom - innerHeight)).toBeLessThanOrEqual(1)
+    }
     const metrics = await dialog.evaluate(element => {
       const panel = element as HTMLElement
       const header = panel.querySelector<HTMLElement>('.app-sheet__header, header')