Add live journal OWM weather and manual GPS fix dialog.

Fetch OpenWeatherMap in live log when a GPS fix is under six hours old, open a fix modal with manual coordinates when geolocation fails, and only show the undo bar after a successful save.

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

client/src/i18n/locales/en.json

@@ -228,12 +228,21 @@
       "live_sails": "Sails: {{sails}}",
       "live_fix": "Fix",
       "live_fix_coords": "Fix {{lat}}, {{lng}}",
+      "live_fix_manual_hint": "GPS unavailable. Enter latitude and longitude manually, or try again with the GPS button.",
+      "live_fix_gps_loading": "Getting GPS position…",
+      "live_fix_invalid": "Please enter valid coordinates (latitude −90…90, longitude −180…180).",
+      "live_fix_lat_placeholder": "Latitude (Lat)",
+      "live_fix_lng_placeholder": "Longitude (Lng)",
       "live_comment_btn": "Comment",
       "live_comment_placeholder": "Enter text…",
       "live_comment_confirm": "Log entry",
       "live_gps_error": "Could not determine GPS position.",
       "live_event_generic": "Event",
       "live_weather_btn": "Weather",
+      "live_weather_owm_btn": "Fetch OpenWeatherMap weather",
+      "live_weather_owm_loading": "Loading weather…",
+      "live_weather_fix_required": "Log a GPS fix first (Fix button) to fetch OpenWeatherMap weather. The position must be at most 6 hours old.",
+      "live_weather_fix_stale": "The last GPS fix is older than 6 hours. Log a new fix before fetching weather.",
       "live_wind_btn": "Wind",
       "live_temp_btn": "Temp °C",
       "live_pressure_btn": "Pressure",