📈(frontend) downgrade unreachable external home URL from error to event

The "unreachable external home URL" check was reporting failures as
errors. In practice, it fired a lot for users behind corporate
networks that cannot reach our public landing page, which is
expected behavior and not something to investigate.

Capture it as a regular telemetry event instead of an error, so it
still gives us visibility on the frequency of the case without
polluting error dashboards.

CHANGELOG.md

@@ -8,6 +8,10 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Fixed
+
+- 📈(frontend) downgrade unreachable external home URL from error to event
+
 ## [1.26.0] - 2026-08-12
 
 ### Added

src/frontend/src/features/home/routes/Home.tsx

@@ -15,7 +15,7 @@ import { css } from '@/styled-system/css'
 import { useConfig } from '@/api/useConfig'
 import { LoginButton } from '@/components/LoginButton'
 import { LoadingScreen } from '@/components/LoadingScreen'
-import { reportError } from '@/features/analytics/telemetry'
+import { captureEvent } from '@/features/analytics/telemetry'
 
 const Columns = ({ children }: { children?: ReactNode }) => {
   return (
@@ -161,8 +161,10 @@ const Home = () => {
           window.location.replace(data.external_home_url)
         } catch (error) {
           setRedirectFailed(true)
-          reportError('generic_failure', error, {
-            context: 'Site is not reachable:',
+          captureEvent('external-home-unreachable', {
+            error_name: error instanceof Error ? error.name : 'Unknown',
+            error_message:
+              error instanceof Error ? error.message : String(error),
           })
         }
       }