feat: weather precip/wind, dashboard mic, remove global voice overlay

- WeatherCard: show precipitation (mm) and max wind speed per forecast day
- DashboardChatInput: add PTT mic button (transcribe-to-input, voice-gated)
- Remove global VoiceOverlay floating button and Space PTT shortcut from
  App.vue — inline mic buttons in chat/briefing/dashboard are the right UX;
  global overlay had focus/latency/context issues

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

src/fabledassistant/services/weather.py

@@ -146,6 +146,8 @@ def parse_weather_card_data(
                 "condition": d["description"],
                 "high": to_temp(d["temp_max"]),
                 "low": to_temp(d["temp_min"]),
+                "precip_mm": round(d["precip_mm"], 1),
+                "windspeed_max": round(d["windspeed_max"]),
             }
             for d in future_days
         ],