v0.11.0: fast times and the Omer

• Fast times: the minor fasts (Tzom Gedaliah, Asara B'Tevet, Ta'anit Esther, 17 Tammuz) now run from dawn to nightfall, and Tisha B'Av from sunset the evening before (after havdalah when it is postponed to Sunday) to havdalah. New options: when minor fasts begin (dawn at 16.1°, the default, or 72 / 90 minutes before sunrise) and end (nightfall for fasts at 6.45°, the default, or the havdalah setting). Fast start times match hebcal.com. Behaviour change: fasts on the holidays calendar and in the calendar link are timed events now, no longer all-day; an automation that relied on them being all-day needs a look.
• New entities: sensor.good_days_next_fast (start of the current or next fast, including Yom Kippur; attributes end, title, in_effect...), binary_sensor.good_days_fasting (on while fasting) and sensor.good_days_omer (day 1-49 of the Omer, moving on at nightfall; attributes weeks, days, the counting sentence in text, next_count, counted).
• Shabbat timers on fast days: "Applies to" has Fast days; on a fast, "candle lighting" means when it begins and "havdalah" when it ends. New preset Breaking the fast (urn / kettle on 30 minutes before the fast ends, off an hour after; fast days and Yom Kippur). A clock time on a minor fast stays on that day.
• Omer reminder (opt-in, off by default): every night of the Omer, at nightfall plus your offset, to the reminder targets, with the counting sentence and a Counted button (good_days_omer event; the Omer sensor's counted attribute lets an automation remind again). With "no reminders during Shabbat and Yom Tov", a Shabbat / Yom Tov night is announced an hour before candle lighting, and the night after it comes after havdalah.
• Card: a fast in progress counts down to its end ("ends in 1:12"); fast rows show when they begin and end; during the Omer a line shows today's count (card option show_omer, on by default). WS good_days/upcoming returns omer.
• Assist: "What's the Omer count?" / "כמה בעומר היום?" and "When does the fast end?" / "מתי נגמר הצום?" (new sentences in docs/assist).