feat: implement sync retry mechanism in ClientRoot with timeout handling

src/app/pages/client/ClientRoot.tsx

@@ -15,7 +15,7 @@ import {
 } from 'folds';
 import { HttpApiEvent, HttpApiEventHandlerMap, MatrixClient, SyncState } from 'matrix-js-sdk';
 import FocusTrap from 'focus-trap-react';
-import React, { MouseEventHandler, ReactNode, useCallback, useEffect, useState } from 'react';
+import React, { MouseEventHandler, ReactNode, useCallback, useEffect, useRef, useState } from 'react';
 import {
   clearCacheAndReload,
   clearLoginData,
@@ -155,9 +155,13 @@ const useBackgroundSync = (mx?: MatrixClient) => {
 type ClientRootProps = {
   children: ReactNode;
 };
+const MAX_SYNC_RETRIES = 3;
+
 export function ClientRoot({ children }: ClientRootProps) {
   const [loading, setLoading] = useState(true);
   const [syncError, setSyncError] = useState<Error | null>(null);
+  const syncRetryCount = useRef(0);
+  const mxRef = useRef<MatrixClient | undefined>(undefined);
   const { baseUrl } = getCurrentSession() ?? {};
 
   // Enable view transitions for smooth navigation
@@ -173,6 +177,11 @@ export function ClientRoot({ children }: ClientRootProps) {
     }, [])
   );
   const mx = loadState.status === AsyncStatus.Success ? loadState.data : undefined;
+
+  useEffect(() => {
+    mxRef.current = mx;
+  }, [mx]);
+
   const [startState, startMatrix] = useAsyncCallback<void, Error, [MatrixClient]>(
     useCallback((m) => startClient(m), [])
   );
@@ -193,14 +202,14 @@ export function ClientRoot({ children }: ClientRootProps) {
     }
   }, [mx, startMatrix]);
 
-  // Timeout if sync takes too long
+  // Timeout if sync takes too long - nudge the client rather than immediately erroring
   useEffect(() => {
     if (!mx || !loading) return;
 
     const timeout = setTimeout(() => {
-      console.error('[ClientRoot] Sync timeout - client failed to reach PREPARED state');
-      setSyncError(new Error('Sync timeout - failed to connect to homeserver'));
-    }, 30000); // 30 second timeout
+      console.warn('[ClientRoot] Sync taking too long, nudging client...');
+      mx.retryImmediately();
+    }, 30000);
 
     return () => clearTimeout(timeout);
   }, [mx, loading]);
@@ -208,13 +217,24 @@ export function ClientRoot({ children }: ClientRootProps) {
   useSyncState(
     mx,
     useCallback((state, prevState, data) => {
+      const client = mxRef.current;
       if (state === 'PREPARED') {
         setLoading(false);
         setSyncError(null);
+        syncRetryCount.current = 0;
       } else if (state === 'ERROR') {
-        const error = data instanceof Error ? data : new Error('Sync failed');
-        console.error('[ClientRoot] Sync error:', error);
-        setSyncError(error);
+        if (syncRetryCount.current < MAX_SYNC_RETRIES) {
+          syncRetryCount.current += 1;
+          const attempt = syncRetryCount.current;
+          console.warn(`[ClientRoot] Sync error, auto-retrying (${attempt}/${MAX_SYNC_RETRIES})...`);
+          setTimeout(() => {
+            if (client) startClient(client).catch(() => {});
+          }, 2000 * attempt);
+        } else {
+          const error = data instanceof Error ? data : new Error('Sync failed');
+          console.error('[ClientRoot] Sync error after max retries:', error);
+          setSyncError(error);
+        }
       }
     }, [])
   );