Show clear offline messages for OWM weather and AI summaries.

Users see localized feedback when OpenWeatherMap or travel-day summary
features are used without connectivity, instead of generic API errors.

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

client/src/services/aiSummary.ts

@@ -5,11 +5,11 @@ import { sortLogEventsByTime, type LogEventPayload } from '../utils/logEntryPayl
 import { PlausibleEvents, trackPlausibleEvent } from './analytics.js'
 
 export class TravelDaySummaryApiError extends Error {
-  code: 'NO_KEY' | 'FORBIDDEN' | 'RATE_LIMITED' | 'REQUEST_FAILED'
+  code: 'NO_KEY' | 'FORBIDDEN' | 'RATE_LIMITED' | 'OFFLINE' | 'REQUEST_FAILED'
 
   constructor(
     message: string,
-    code: 'NO_KEY' | 'FORBIDDEN' | 'RATE_LIMITED' | 'REQUEST_FAILED' = 'REQUEST_FAILED'
+    code: 'NO_KEY' | 'FORBIDDEN' | 'RATE_LIMITED' | 'OFFLINE' | 'REQUEST_FAILED' = 'REQUEST_FAILED'
   ) {
     super(message)
     this.name = 'TravelDaySummaryApiError'
@@ -146,6 +146,10 @@ export async function generateTravelDaySummary(params: {
   language: string
   context: TravelDaySummaryContext
 }): Promise<{ summary: string; remainingAttempts: number; maxAttempts: number }> {
+  if (!navigator.onLine) {
+    throw new TravelDaySummaryApiError('Offline', 'OFFLINE')
+  }
+
   const controller = new AbortController()
   const timeoutId = window.setTimeout(() => controller.abort(), SUMMARY_FETCH_TIMEOUT_MS)
 

client/src/services/weather.test.ts

@@ -44,6 +44,17 @@ describe('fetchOpenWeatherCurrent', () => {
     })
   })
 
+  it('throws OFFLINE when navigator.onLine is false', async () => {
+    vi.stubGlobal('navigator', { ...navigator, onLine: false })
+
+    const { fetchOpenWeatherCurrent, WeatherApiError } = await import('./weather.js')
+    const err = await fetchOpenWeatherCurrent({ lat: '54', lon: '10' }).catch((e) => e)
+    expect(err).toBeInstanceOf(WeatherApiError)
+    expect((err as InstanceType<typeof WeatherApiError>).code).toBe('OFFLINE')
+
+    expect(apiFetch).not.toHaveBeenCalled()
+  })
+
   it('does not track when the API request fails', async () => {
     apiFetch.mockResolvedValue({
       ok: false,

client/src/services/weather.ts

@@ -7,9 +7,9 @@ import {
 } from './analytics.js'
 
 export class WeatherApiError extends Error {
-  code: 'NO_KEY' | 'REQUEST_FAILED'
+  code: 'NO_KEY' | 'OFFLINE' | 'REQUEST_FAILED'
 
-  constructor(message: string, code: 'NO_KEY' | 'REQUEST_FAILED' = 'REQUEST_FAILED') {
+  constructor(message: string, code: 'NO_KEY' | 'OFFLINE' | 'REQUEST_FAILED' = 'REQUEST_FAILED') {
     super(message)
     this.name = 'WeatherApiError'
     this.code = code
@@ -26,6 +26,10 @@ export async function fetchOpenWeatherCurrent(
   },
   options?: { analyticsSource: OwmAnalyticsSource }
 ): Promise<Record<string, unknown>> {
+  if (!navigator.onLine) {
+    throw new WeatherApiError('Offline', 'OFFLINE')
+  }
+
   const searchParams = new URLSearchParams()
 
   if (params.lat && params.lon) {