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/utils/liveLogPosition.test.ts

@@ -0,0 +1,54 @@
+import { describe, expect, it } from 'vitest'
+import {
+  getLastPositionFixWithin,
+  getLatestPositionFix,
+  LIVE_EVENT_CODES,
+  LIVE_LOG_WEATHER_POSITION_MAX_AGE_MS
+} from './liveEventCodes.js'
+
+const entryDate = '2026-06-01'
+
+describe('live log position fix', () => {
+  it('returns latest fix with coordinates', () => {
+    const events = [
+      { remarks: LIVE_EVENT_CODES.FIX, time: '08:00', gpsLat: '54.1', gpsLng: '10.2' },
+      { remarks: LIVE_EVENT_CODES.FIX, time: '12:30', gpsLat: '54.2', gpsLng: '10.3' }
+    ]
+    const fix = getLatestPositionFix(events, entryDate)
+    expect(fix?.lat).toBe('54.2')
+    expect(fix?.source).toBe('fix')
+  })
+
+  it('accepts auto-position with GPS', () => {
+    const events = [
+      {
+        remarks: LIVE_EVENT_CODES.AUTO_POSITION,
+        time: '14:00',
+        gpsLat: '55.0',
+        gpsLng: '11.0'
+      }
+    ]
+    expect(getLatestPositionFix(events, entryDate)?.source).toBe('auto_position')
+  })
+
+  it('rejects fix older than max age for weather', () => {
+    const noon = new Date(`${entryDate}T12:00:00`).getTime()
+    const events = [
+      { remarks: LIVE_EVENT_CODES.FIX, time: '05:00', gpsLat: '54.0', gpsLng: '10.0' }
+    ]
+    expect(
+      getLastPositionFixWithin(events, entryDate, LIVE_LOG_WEATHER_POSITION_MAX_AGE_MS, noon)
+    ).toBeNull()
+    expect(getLatestPositionFix(events, entryDate)).not.toBeNull()
+  })
+
+  it('accepts fix within six hours', () => {
+    const noon = new Date(`${entryDate}T12:00:00`).getTime()
+    const events = [
+      { remarks: LIVE_EVENT_CODES.FIX, time: '07:00', gpsLat: '54.0', gpsLng: '10.0' }
+    ]
+    expect(
+      getLastPositionFixWithin(events, entryDate, LIVE_LOG_WEATHER_POSITION_MAX_AGE_MS, noon)
+    ).not.toBeNull()
+  })
+})