feat(weather): add hourly precipitation summaries and peak timing to weather card

Fetch hourly precipitation probabilities from Open-Meteo alongside daily
forecasts. Generate human-readable precip summaries ("Rain likely 2–5 PM",
"Rain likely all day") for today and each forecast day. Display today's
summary as a styled callout and show peak precipitation hour in forecast rows.
Also fix briefing pipeline to parse all weather location rows (not just first).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/fabledassistant/services/briefing_pipeline.py

@@ -379,7 +379,11 @@ async def run_compilation(
         if item.get("id")
     ]
 
-    weather_card = parse_weather_card_data(weather_rows[0], temp_unit) if weather_rows else None
+    weather_cards = [
+        card for row in weather_rows
+        if (card := parse_weather_card_data(row, temp_unit)) is not None
+    ]
+    weather_card = weather_cards[0] if weather_cards else None
 
     briefing_text, agentic_messages = await run_agentic_briefing(
         user_id, slot, model, conv_id=None, rss_override=filtered_rss,