Fix startup connection and chunk recovery

packages/ui/src/App.tsx

@@ -55,9 +55,10 @@ import { TooltipProvider } from '@/components/ui/tooltip';
 import { QuickOpenDialog } from '@/components/ui/QuickOpenDialog';
 import { McpOAuthCallbackPage } from '@/components/sections/mcp/McpOAuthCallbackPage';
 import { MCP_OAUTH_CALLBACK_PATH } from '@/components/sections/mcp/mcpOAuth';
+import { lazyWithChunkRecovery } from '@/lib/chunkLoadRecovery';
 
 // Lazy-loaded heavy views — loaded on demand to reduce initial bundle size.
-const OnboardingScreen = React.lazy(() =>
+const OnboardingScreen = lazyWithChunkRecovery(() =>
   import('@/components/onboarding/OnboardingScreen').then((m) => ({ default: m.OnboardingScreen })),
 );
 
@@ -206,6 +207,7 @@ function App({ apis }: AppProps) {
       : null;
   });
   const appReadyDispatchedRef = React.useRef(false);
+  const initializationInFlightRef = React.useRef(false);
   const embeddedSessionChat = React.useMemo<EmbeddedSessionChatConfig | null>(() => readEmbeddedSessionChatConfig(), []);
   const embeddedBackgroundWorkEnabled = !embeddedSessionChat || isEmbeddedVisible;
   const isMcpOAuthCallback = React.useMemo(() => isMcpOAuthCallbackPath(), []);
@@ -345,12 +347,55 @@ function App({ apis }: AppProps) {
       if (isVSCodeRuntime) {
         return;
       }
-      await initializeApp();
+      if (initializationInFlightRef.current) {
+        return;
+      }
+      initializationInFlightRef.current = true;
+      try {
+        await initializeApp();
+      } finally {
+        initializationInFlightRef.current = false;
+      }
     };
 
     init();
   }, [initializeApp, isVSCodeRuntime]);
 
+  React.useEffect(() => {
+    if (isVSCodeRuntime || isInitialized) return;
+
+    let active = true;
+    let retryTimer: ReturnType<typeof setTimeout> | undefined;
+
+    const retryInitialization = async () => {
+      if (!active) return;
+      const state = useConfigStore.getState();
+      if (state.isInitialized) return;
+      if (initializationInFlightRef.current) {
+        retryTimer = setTimeout(retryInitialization, 1000);
+        return;
+      }
+
+      initializationInFlightRef.current = true;
+      try {
+        await state.initializeApp();
+      } finally {
+        initializationInFlightRef.current = false;
+      }
+
+      const next = useConfigStore.getState();
+      if (!active || next.isInitialized) return;
+      retryTimer = setTimeout(retryInitialization, 1000);
+    };
+
+    retryTimer = setTimeout(retryInitialization, 1000);
+
+    return () => {
+      active = false;
+      if (retryTimer) clearTimeout(retryTimer);
+    };
+  }, [isInitialized, isVSCodeRuntime]);
+
   // Startup recovery: poll until providers AND agents are loaded.
   // loadProviders/loadAgents resolve normally even on failure (errors swallowed),
   // so a reactive effect can't detect failure — we need an interval.

packages/ui/src/components/chat/ChatMessage.tsx

@@ -26,13 +26,14 @@ import { filterVisibleParts } from './message/partUtils';
 import { normalizeUserDisplayParts } from './message/normalizeUserDisplayParts';
 import { flattenAssistantTextParts } from '@/lib/messages/messageText';
 import { isLikelyProviderAuthFailure, PROVIDER_AUTH_FAILURE_MESSAGE } from '@/lib/messages/providerAuthError';
+import { lazyWithChunkRecovery } from '@/lib/chunkLoadRecovery';
 import type { TurnGroupingContext } from './lib/turns/types';
 import { copyTextToClipboard } from '@/lib/clipboard';
 import { FadeInOnReveal } from './message/FadeInOnReveal';
 import { streamPerfCount } from '@/stores/utils/streamDebug';
 import { areOptionalRenderRelevantMessagesEqual, areRenderRelevantMessagesEqual, areRelevantTurnGroupingContextsEqual } from './message/renderCompare';
 
-const ToolOutputDialog = React.lazy(() => import('./message/ToolOutputDialog'));
+const ToolOutputDialog = lazyWithChunkRecovery(() => import('./message/ToolOutputDialog'));
 
 const EXPANDED_TOOLS_CACHE_MAX = 4000;
 const expandedToolsStateCache = new Map<string, Set<string>>();

packages/ui/src/components/chat/MarkdownRenderer.tsx

@@ -1,4 +1,5 @@
 import React from 'react';
+import { lazyWithChunkRecovery } from '@/lib/chunkLoadRecovery';
 
 // Thin lazy wrapper around the heavy MarkdownRenderer implementation.
 // The full implementation (marked, react-markdown, beautiful-mermaid,
@@ -8,11 +9,11 @@ import React from 'react';
 export type { MarkdownVariant } from './MarkdownRendererImpl';
 
 
-const MarkdownRendererLazy = React.lazy(() =>
+const MarkdownRendererLazy = lazyWithChunkRecovery(() =>
   import('./MarkdownRendererImpl').then((m) => ({ default: m.MarkdownRenderer }))
 );
 
-const SimpleMarkdownRendererLazy = React.lazy(() =>
+const SimpleMarkdownRendererLazy = lazyWithChunkRecovery(() =>
   import('./MarkdownRendererImpl').then((m) => ({ default: m.SimpleMarkdownRenderer }))
 );
 

packages/ui/src/components/layout/MainLayout.tsx

@@ -22,18 +22,19 @@ import { useDeviceInfo } from '@/lib/device';
 import { useEffectiveDirectory } from '@/hooks/useEffectiveDirectory';
 import { cn } from '@/lib/utils';
 import { isDesktopShell } from '@/lib/desktop';
+import { lazyWithChunkRecovery } from '@/lib/chunkLoadRecovery';
 
 import { ChatView } from '@/components/views';
 
 // Heavy views loaded on-demand to reduce initial bundle parse time.
-const PlanView = React.lazy(() => import('@/components/views/PlanView').then(m => ({ default: m.PlanView })));
-const GitView = React.lazy(() => import('@/components/views/GitView').then(m => ({ default: m.GitView })));
-const DiffView = React.lazy(() => import('@/components/views/DiffView').then(m => ({ default: m.DiffView })));
-const TerminalView = React.lazy(() => import('@/components/views/TerminalView').then(m => ({ default: m.TerminalView })));
-const FilesView = React.lazy(() => import('@/components/views/FilesView').then(m => ({ default: m.FilesView })));
-const SettingsView = React.lazy(() => import('@/components/views/SettingsView').then(m => ({ default: m.SettingsView })));
-const SettingsWindow = React.lazy(() => import('@/components/views/SettingsWindow').then(m => ({ default: m.SettingsWindow })));
-const MultiRunWindow = React.lazy(() => import('@/components/views/MultiRunWindow').then(m => ({ default: m.MultiRunWindow })));
+const PlanView = lazyWithChunkRecovery(() => import('@/components/views/PlanView').then(m => ({ default: m.PlanView })));
+const GitView = lazyWithChunkRecovery(() => import('@/components/views/GitView').then(m => ({ default: m.GitView })));
+const DiffView = lazyWithChunkRecovery(() => import('@/components/views/DiffView').then(m => ({ default: m.DiffView })));
+const TerminalView = lazyWithChunkRecovery(() => import('@/components/views/TerminalView').then(m => ({ default: m.TerminalView })));
+const FilesView = lazyWithChunkRecovery(() => import('@/components/views/FilesView').then(m => ({ default: m.FilesView })));
+const SettingsView = lazyWithChunkRecovery(() => import('@/components/views/SettingsView').then(m => ({ default: m.SettingsView })));
+const SettingsWindow = lazyWithChunkRecovery(() => import('@/components/views/SettingsWindow').then(m => ({ default: m.SettingsWindow })));
+const MultiRunWindow = lazyWithChunkRecovery(() => import('@/components/views/MultiRunWindow').then(m => ({ default: m.MultiRunWindow })));
 
 // Mobile drawer width as screen percentage
 const MOBILE_DRAWER_WIDTH_PERCENT = 85;

packages/ui/src/components/layout/VSCodeLayout.tsx

@@ -24,10 +24,11 @@ import { PaceIndicator } from '@/components/sections/usage/PaceIndicator';
 import { formatPercent, formatWindowLabel, QUOTA_PROVIDERS, calculatePace, calculateExpectedUsagePercent } from '@/lib/quota';
 import { useQuotaAutoRefresh, useQuotaStore } from '@/stores/useQuotaStore';
 import { updateDesktopSettings } from '@/lib/persistence';
+import { lazyWithChunkRecovery } from '@/lib/chunkLoadRecovery';
 import type { UsageWindow } from '@/types';
 import { RiAddLine, RiArrowLeftLine, RiRefreshLine, RiRobot2Line, RiSettings3Line, RiTimerLine } from '@remixicon/react';
 
-const SettingsView = React.lazy(() => import('@/components/views/SettingsView').then(m => ({ default: m.SettingsView })));
+const SettingsView = lazyWithChunkRecovery(() => import('@/components/views/SettingsView').then(m => ({ default: m.SettingsView })));
 
 const formatTime = (timestamp: number | null) => {
   if (!timestamp) return '-';

packages/ui/src/lib/chunkLoadRecovery.ts

@@ -0,0 +1,93 @@
+import { lazy } from 'react';
+
+declare const __APP_VERSION__: string | undefined;
+
+const RELOAD_STORAGE_KEY = 'openchamber:chunk-import-reload';
+const RETRY_DELAY_MS = 250;
+const RELOAD_GUARD_MS = 30_000;
+
+const DYNAMIC_IMPORT_ERROR_PATTERNS = [
+  /Importing a module script failed/i,
+  /Failed to fetch dynamically imported module/i,
+  /error loading dynamically imported module/i,
+  /Loading chunk \S+ failed/i,
+  /ChunkLoadError/i,
+];
+
+function readErrorText(error: unknown): string {
+  if (error instanceof Error) {
+    return `${error.name}\n${error.message}\n${error.stack ?? ''}`;
+  }
+
+  if (typeof error === 'string') {
+    return error;
+  }
+
+  try {
+    return JSON.stringify(error);
+  } catch {
+    return String(error);
+  }
+}
+
+function isDynamicImportError(error: unknown): boolean {
+  const text = readErrorText(error);
+  return DYNAMIC_IMPORT_ERROR_PATTERNS.some((pattern) => pattern.test(text));
+}
+
+function reloadMarkerSignature(error: unknown): string {
+  const appVersion = typeof __APP_VERSION__ !== 'undefined' ? __APP_VERSION__ : 'unknown';
+  return `${appVersion || 'unknown'}:${readErrorText(error).slice(0, 500)}`;
+}
+
+function scheduleReloadOnce(error: unknown): void {
+  if (typeof window === 'undefined') return;
+
+  const now = Date.now();
+  const signature = reloadMarkerSignature(error);
+
+  try {
+    const rawMarker = window.sessionStorage.getItem(RELOAD_STORAGE_KEY);
+    const marker = rawMarker ? JSON.parse(rawMarker) as { signature?: unknown; timestamp?: unknown } : null;
+    const markerTimestamp = typeof marker?.timestamp === 'number' ? marker.timestamp : 0;
+    if (marker?.signature === signature && now - markerTimestamp < RELOAD_GUARD_MS) {
+      return;
+    }
+    window.sessionStorage.setItem(RELOAD_STORAGE_KEY, JSON.stringify({ signature, timestamp: now }));
+  } catch {
+    return;
+  }
+
+  window.setTimeout(() => {
+    window.location.reload();
+  }, 0);
+}
+
+export async function importWithChunkRecovery<T>(
+  load: () => Promise<T>,
+  options: { retries?: number } = {},
+): Promise<T> {
+  const retries = options.retries ?? 1;
+  let lastError: unknown;
+
+  for (let attempt = 0; attempt <= retries; attempt += 1) {
+    try {
+      return await load();
+    } catch (error) {
+      lastError = error;
+      if (!isDynamicImportError(error) || attempt >= retries) {
+        break;
+      }
+
+      await new Promise((resolve) => setTimeout(resolve, RETRY_DELAY_MS * (attempt + 1)));
+    }
+  }
+
+  if (isDynamicImportError(lastError)) {
+    scheduleReloadOnce(lastError);
+  }
+
+  throw lastError;
+}
+
+export const lazyWithChunkRecovery: typeof lazy = (load) => lazy(() => importWithChunkRecovery(load));

packages/ui/src/stores/useConfigStore.ts

@@ -426,6 +426,14 @@ const ensureModelsMetadataFetch = (
 };
 
 const sleep = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
+const CONNECTION_PROBE_TIMEOUT_MS = 800;
+
+const probeOpenCodeHealth = async (timeoutMs = CONNECTION_PROBE_TIMEOUT_MS): Promise<boolean> => {
+    return Promise.race([
+        opencodeClient.checkHealth().catch(() => false),
+        sleep(Math.max(1, timeoutMs)).then(() => false),
+    ]);
+};
 
 const DIRECTORY_KEY_GLOBAL = "__global__";
 
@@ -560,6 +568,7 @@ interface ConfigStore {
     getResolvedGitGenerationModel: () => { providerId: string; modelId: string } | null;
     saveAgentModelSelection: (agentName: string, providerId: string, modelId: string) => void;
     getAgentModelSelection: (agentName: string) => { providerId: string; modelId: string } | null;
+    probeConnection: (options?: { timeoutMs?: number }) => Promise<boolean>;
     checkConnection: () => Promise<boolean>;
     initializeApp: () => Promise<void>;
     getCurrentProvider: () => ProviderWithModelList | undefined;
@@ -1899,6 +1908,26 @@ export const useConfigStore = create<ConfigStore>()(
                     }
                 },
 
+                probeConnection: async (options?: { timeoutMs?: number }) => {
+                    const isHealthy = await probeOpenCodeHealth(options?.timeoutMs);
+                    if (isHealthy) {
+                        set({ isConnected: true, hasEverConnected: true, connectionPhase: "connected" });
+                        return true;
+                    }
+
+                    const state = get();
+                    if (state.isConnected) {
+                        return true;
+                    }
+
+                    set({
+                        isConnected: false,
+                        connectionPhase: state.hasEverConnected ? "reconnecting" : "connecting",
+                        lastDisconnectReason: 'health_probe_unhealthy',
+                    });
+                    return false;
+                },
+
                 checkConnection: async () => {
                     const maxAttempts = 5;
                     let attempt = 0;

packages/ui/src/sync/session-actions.ts

@@ -67,14 +67,20 @@ function connectionLostError(): Error {
 // Wait briefly for the pipeline to re-establish connection before failing a
 // send. Transient reconnects (heartbeat race, WS→SSE fallback, brief network
 // blip) otherwise surface as a hard "Connection lost" toast even though the
-// pipeline recovers within a second. Poll isConnected at 100ms intervals.
+// pipeline recovers within a second. While waiting, run bounded health probes
+// inside the same grace window so stale disconnected state can recover quickly.
 const CONNECTION_GRACE_MS = 2000
 export async function waitForConnectionOrThrow(): Promise<void> {
-  if (useConfigStore.getState().isConnected) return
   const deadline = Date.now() + CONNECTION_GRACE_MS
   while (Date.now() < deadline) {
-    await new Promise((resolve) => setTimeout(resolve, 100))
     if (useConfigStore.getState().isConnected) return
+    const remainingMs = deadline - Date.now()
+    if (remainingMs <= 0) break
+    if (await useConfigStore.getState().probeConnection({ timeoutMs: Math.min(500, remainingMs) })) return
+    const sleepMs = Math.min(100, deadline - Date.now())
+    if (sleepMs > 0) {
+      await new Promise((resolve) => setTimeout(resolve, sleepMs))
+    }
   }
   throw connectionLostError()
 }