feat: weather conditions check from stroy-bot-main

Ports the weather check added to stroy-bot-main on 2026-10-16: daily
station weather, report positions with weather per shift and the AI
assessment of working conditions. Opens as ?page=weather&start=&end=
instead of the #weathercheck hash, and hub dates survive the way back.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/webparts/stroyBot/pages/weather/EmptyValue.tsx

@@ -0,0 +1,6 @@
+import * as React from 'react';
+import { WEATHER_TEXTS } from './texts';
+import styles from './WeatherPage.module.scss';
+
+/** Серый прочерк вместо пустого значения в таблицах сверки. */
+export const EmptyValue: React.FC = () => <span className={styles.muted}>{WEATHER_TEXTS.empty}</span>;