fix: auto re-fetch system config after invalidation

- invalidateSystemConfig() now dispatches a custom event
- useSystemConfig() listens for the event and re-fetches automatically
- Fixes stale initialized=false after register/logout causing
  incorrect redirect to SetupPage

web/src/hooks/useSystemConfig.ts

@@ -1,13 +1,15 @@
-import { useEffect, useState } from 'react'
-import { getSystemConfig, type SystemConfig } from '../lib/config'
+import { useEffect, useState, useCallback } from 'react'
+import { getSystemConfig, invalidateSystemConfig, type SystemConfig } from '../lib/config'
 
 export function useSystemConfig() {
   const [config, setConfig] = useState<SystemConfig | null>(null)
   const [loading, setLoading] = useState(true)
   const [error, setError] = useState<string | null>(null)
+  const [fetchKey, setFetchKey] = useState(0)
 
   useEffect(() => {
     let mounted = true
+    setLoading(true)
     getSystemConfig()
       .then((data) => {
         if (!mounted) return
@@ -23,7 +25,18 @@ export function useSystemConfig() {
     return () => {
       mounted = false
     }
+  }, [fetchKey])
+
+  // Listen for invalidation events and re-fetch automatically
+  useEffect(() => {
+    const handler = () => setFetchKey((k) => k + 1)
+    window.addEventListener('system-config-invalidated', handler)
+    return () => window.removeEventListener('system-config-invalidated', handler)
   }, [])
 
-  return { config, loading, error }
+  const refresh = useCallback(() => {
+    invalidateSystemConfig()
+  }, [])
+
+  return { config, loading, error, refresh }
 }

web/src/lib/config.ts

@@ -26,4 +26,5 @@ export function getSystemConfig(): Promise<SystemConfig> {
 export function invalidateSystemConfig() {
   cachedConfig = null
   configPromise = null
+  window.dispatchEvent(new Event('system-config-invalidated'))
 }