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/de.json

@@ -280,6 +280,7 @@
       "live_pressure_btn": "Luftdruck",
       "live_precip_btn": "Niederschlag",
       "live_sea_state_btn": "Seegang",
+      "live_visibility_btn": "Sichtweite",
       "live_course_btn": "Kurs",
       "live_fuel_btn": "Diesel",
       "live_water_btn": "Wasser",
@@ -288,6 +289,7 @@
       "live_pressure_entry": "Luftdruck {{value}} hPa",
       "live_precip_entry": "Niederschlag {{value}}",
       "live_sea_state_entry": "Seegang {{value}}",
+      "live_visibility_entry": "Sichtweite {{value}}",
       "live_course_entry": "Kurs {{course}}",
       "live_fuel_entry": "Diesel +{{liters}} L",
       "live_water_entry": "Wasser +{{liters}} L",
@@ -298,6 +300,7 @@
       "live_temp_placeholder": "z. B. 18",
       "live_precip_placeholder": "z. B. leichter Regen",
       "live_sea_state_placeholder": "z. B. 3",
+      "live_visibility_placeholder": "z. B. 10 km",
       "live_course_placeholder": "z. B. 245",
       "live_fuel_placeholder": "Nachgefüllte Liter",
       "live_water_placeholder": "Nachgefüllte Liter",
@@ -339,6 +342,12 @@
       "event_wind_direction": "Wind-Richtung",
       "event_wind_strength": "Windstärke",
       "event_sea_state": "Seegang",
+      "event_visibility": "Sichtweite",
+      "event_visibility_placeholder": "z. B. 10 km",
+      "weather_slider_unset": "—",
+      "weather_slider_pressure": "{{value}} hPa",
+      "weather_slider_sea_state": "Stufe {{value}}",
+      "weather_slider_heel": "{{value}}°",
       "event_weather": "Wetter",
       "event_log": "Logge (sm)",
       "event_gps": "GPS-Position",