feat: add Windows ARM64 support with x64-baseline CLI workaround (#2537)

* feat: add Windows ARM64 support with x64-baseline CLI workaround

Windows ARM64 native opencode.exe fails with a Bun FFI/TinyCC dlopen
error (anomalyco/opencode#19130). As a temporary workaround:

- Bundle x64-baseline OpenCode CLI on ARM64 instead of native ARM64
  (prepare-opencode-cli.mjs, env-runtime.js)
- Disable OpenCode self-upgrade on ARM64 in server, VS Code, and UI
  (upgrade-capability.js, opencode-upgrade-runtime.ts, useUIStore.ts,
  OpenCodeCliSettings.tsx, search.ts, SettingsView.tsx, platform.ts)
- Add ARM64 Windows cross-compile builds to release and smoke workflows
  (release.yml, release-desktop-smoke.yml)
- Refactor Windows latest.yml to use combine-electron-manifests pattern
  matching macOS, since two arches now produce per-arch manifests

The CI ARM64 build itself is permanent; only the x64-baseline CLI
bundling and upgrade disablement are temporary and should be reverted
when the upstream issue is resolved.

* fix(desktop): select Windows updater by architecture

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/components/sections/openchamber/OpenCodeCliSettings.tsx

@@ -16,6 +16,7 @@ import { reloadOpenCodeConfiguration } from '@/stores/useAgentsStore';
 import { useUIStore } from '@/stores/useUIStore';
 import { useI18n } from '@/lib/i18n';
 import { runtimeFetch } from '@/lib/runtime-fetch';
+import { isWindowsArm64 } from '@/lib/platform';
 
 export const OpenCodeCliSettings: React.FC = () => {
   const { t } = useI18n();
@@ -151,13 +152,15 @@ export const OpenCodeCliSettings: React.FC = () => {
         </SettingsFieldRow>
 
         <SettingsInset className={SETTINGS_OPTION_STACK_CLASS}>
-          <SettingsCheckboxRow
-            settingsItem="sessions.opencode-update-notifications"
-            checked={showOpenCodeUpdateNotifications}
-            onChange={handleShowUpdateNotificationsChange}
-            label={t('settings.openchamber.opencodeCli.field.showUpdateNotifications')}
-            ariaLabel={t('settings.openchamber.opencodeCli.field.showUpdateNotificationsAria')}
-          />
+          {!isWindowsArm64() && (
+            <SettingsCheckboxRow
+              settingsItem="sessions.opencode-update-notifications"
+              checked={showOpenCodeUpdateNotifications}
+              onChange={handleShowUpdateNotificationsChange}
+              label={t('settings.openchamber.opencodeCli.field.showUpdateNotifications')}
+              ariaLabel={t('settings.openchamber.opencodeCli.field.showUpdateNotificationsAria')}
+            />
+          )}
 
           <SettingsCheckboxRow
             settingsItem="sessions.agent-control-tool"

packages/ui/src/components/views/SettingsView.tsx

@@ -43,6 +43,7 @@ import {
 } from '@/components/sections/shared/SettingsSection';
 import { useDeviceInfo } from '@/lib/device';
 import { isDesktopLocalOriginActive, isDesktopShell, isVSCodeRuntime, isWebRuntime } from '@/lib/desktop';
+import { isWindowsArm64 as isWindowsArm64Platform } from '@/lib/platform';
 import { useI18n } from '@/lib/i18n';
 import { Icon } from "@/components/icon/Icon";
 import type { IconName } from "@/components/icon/icons";
@@ -278,6 +279,7 @@ export const SettingsView: React.FC<SettingsViewProps> = ({ onClose, forceMobile
     return isDesktopShell() && typeof window !== 'undefined'
       && (window as unknown as { __OPENCHAMBER_PLATFORM__?: string }).__OPENCHAMBER_PLATFORM__ === 'linux';
   }, []);
+  const isWindowsArm64 = React.useMemo(() => isWindowsArm64Platform(), []);
 
   // keep platform check available for future window chrome tweaks
 
@@ -421,12 +423,12 @@ export const SettingsView: React.FC<SettingsViewProps> = ({ onClose, forceMobile
   const settingsSearchResults = React.useMemo(() => {
     return buildSettingsSearchResults({
       query: settingsSearchQuery,
-      runtimeCtx: { ...runtimeCtx, isDesktopLocalOrigin, isMac, isWindows, isLinux },
+      runtimeCtx: { ...runtimeCtx, isDesktopLocalOrigin, isMac, isWindows, isLinux, isWindowsArm64 },
       visiblePageSlugs,
       t,
       getPageTitle,
     });
-  }, [getPageTitle, isDesktopLocalOrigin, isMac, isWindows, isLinux, runtimeCtx, settingsSearchQuery, t, visiblePageSlugs]);
+  }, [getPageTitle, isWindowsArm64, isDesktopLocalOrigin, isMac, isWindows, isLinux, runtimeCtx, settingsSearchQuery, t, visiblePageSlugs]);
 
   const prepareSettingsSearchTarget = React.useCallback((result: SettingsSearchResult): string => {
     if (result.id.startsWith('agents.')) {

packages/ui/src/lib/platform.ts

@@ -7,6 +7,39 @@ export const isCapacitorApp = (): boolean => {
   return capacitor?.isNativePlatform?.() === true || window.location.protocol === 'capacitor:';
 };
 
+// TEMPORARY WORKAROUND — Windows ARM64: native opencode.exe fails with a Bun
+// FFI/TinyCC dlopen error (https://github.com/anomalyco/opencode/issues/19130).
+// Suppress OpenCode update UI on ARM64 so it can't self-upgrade to the broken
+// ARM64 build. Remove this helper and its call sites when resolved upstream.
+export const isWindowsArm64 = (): boolean => {
+  if (typeof window === 'undefined') return false;
+
+  const electronArch = window.__OPENCHAMBER_ELECTRON__?.arch?.toLowerCase?.();
+  if (electronArch === 'arm64' || electronArch === 'aarch64') {
+    const platform = (navigator.platform || '').toLowerCase();
+    return platform.includes('win');
+  }
+
+  const vscodeArch = (window as { __VSCODE_CONFIG__?: { arch?: string } }).__VSCODE_CONFIG__?.arch?.toLowerCase?.();
+  if (vscodeArch === 'arm64' || vscodeArch === 'aarch64') {
+    const platform = (navigator.platform || '').toLowerCase();
+    return platform.includes('win');
+  }
+
+  const nav = (navigator as Navigator & { userAgentData?: { architecture?: string; platform?: string } }).userAgentData;
+  if (nav?.architecture?.toLowerCase?.() === 'arm64' || nav?.architecture?.toLowerCase?.() === 'aarch64') {
+    const platform = (nav.platform || navigator.platform || '').toLowerCase();
+    return platform.includes('win');
+  }
+
+  const ua = navigator.userAgent.toLowerCase();
+  if ((ua.includes('aarch64') || ua.includes('arm64') || ua.includes('armv')) && ua.includes('windows')) {
+    return true;
+  }
+
+  return false;
+};
+
 /**
  * True when running inside the native Capacitor shell on an iPad.
  * Capacitor reports 'ios' for both iPhone and iPad; iPadOS WKWebView

packages/ui/src/lib/settings/search.ts

@@ -26,6 +26,8 @@ interface SettingsSearchAvailabilityContext extends SettingsRuntimeContext {
   isWindows: boolean;
   // Linux desktop shell — for controls that only render on linux.
   isLinux: boolean;
+  // Windows ARM64 — temporary workaround gate (see opencode#19130).
+  isWindowsArm64: boolean;
 }
 
 const SETTINGS_SEARCH_ITEMS: readonly SettingsSearchItem[] = [
@@ -470,7 +472,7 @@ const SETTINGS_SEARCH_ITEMS: readonly SettingsSearchItem[] = [
     page: 'general',
     titleKey: 'settings.openchamber.opencodeCli.field.showUpdateNotifications',
     keywords: ['opencode', 'cli', 'updates'],
-    isAvailable: (ctx) => !ctx.isVSCode,
+    isAvailable: (ctx) => !ctx.isVSCode && !ctx.isWindowsArm64,
   },
   {
     id: 'sessions.agent-control-tool',

packages/ui/src/stores/useUIStore.ts

@@ -10,6 +10,7 @@ import { getStoredMobileKeyboardMode, type MobileKeyboardMode } from '@/lib/mobi
 import { getRuntimeKey } from '@/lib/runtime-switch';
 import type { TerminalShell } from '@/lib/api/types';
 import { useFilesViewTabsStore } from './useFilesViewTabsStore';
+import { isWindowsArm64 } from '@/lib/platform';
 
 export type MainTab = 'chat' | 'plan' | 'git' | 'diff' | 'terminal' | 'files' | 'context' | 'diagram';
 export type PendingDiffScope = 'working' | 'staged' | 'turn';
@@ -999,7 +1000,7 @@ export const useUIStore = create<UIStore>()(
 
         showTerminalQuickKeysOnDesktop: false,
         persistChatDraft: true,
-        showOpenCodeUpdateNotifications: true,
+        showOpenCodeUpdateNotifications: !isWindowsArm64(),
         agentControlToolEnabled: true,
         inputSpellcheckEnabled: false,
         wideChatLayoutEnabled: false,