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"