feat(logs): Sichtweite und kompakte Wetter-Slider im Ereignisprotokoll

Ergänzt visibility in Editor und Live-Log inkl. OWM-Übernahme, CSV-Export
und touch-taugliche Slider für Luftdruck, Seegang, Sichtweite und Krängung.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/i18n/locales/en.json

@@ -280,6 +280,7 @@
       "live_pressure_btn": "Pressure",
       "live_precip_btn": "Precipitation",
       "live_sea_state_btn": "Sea state",
+      "live_visibility_btn": "Visibility",
       "live_course_btn": "Course",
       "live_fuel_btn": "Fuel",
       "live_water_btn": "Water",
@@ -288,6 +289,7 @@
       "live_pressure_entry": "Pressure {{value}} hPa",
       "live_precip_entry": "Precipitation {{value}}",
       "live_sea_state_entry": "Sea state {{value}}",
+      "live_visibility_entry": "Visibility {{value}}",
       "live_course_entry": "Course {{course}}",
       "live_fuel_entry": "Fuel +{{liters}} L",
       "live_water_entry": "Water +{{liters}} L",
@@ -298,6 +300,7 @@
       "live_temp_placeholder": "e.g. 18",
       "live_precip_placeholder": "e.g. light rain",
       "live_sea_state_placeholder": "e.g. 3",
+      "live_visibility_placeholder": "e.g. 10 km",
       "live_course_placeholder": "e.g. 245",
       "live_fuel_placeholder": "Liters refilled",
       "live_water_placeholder": "Liters refilled",
@@ -339,6 +342,12 @@
       "event_wind_direction": "Wind Dir",
       "event_wind_strength": "Wind Str",
       "event_sea_state": "Sea State",
+      "event_visibility": "Visibility",
+      "event_visibility_placeholder": "e.g. 10 km",
+      "weather_slider_unset": "—",
+      "weather_slider_pressure": "{{value}} hPa",
+      "weather_slider_sea_state": "State {{value}}",
+      "weather_slider_heel": "{{value}}°",
       "event_weather": "Weather",
       "event_log": "Log (nm)",
       "event_gps": "GPS Position",