fix: restore desktop window dragging on remote instances

- Fixes header drag behavior in Desktop when connected to remote hosts
- Routes all window-drag entry points through a shared safe desktop helper
- Keeps local desktop drag behavior unchanged while avoiding remote IPC failures

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

@@ -62,7 +62,7 @@ import type { SessionContextUsage } from '@/stores/types/sessionTypes';
 import { DesktopHostSwitcherDialog } from '@/components/desktop/DesktopHostSwitcher';
 import { OpenInAppButton } from '@/components/desktop/OpenInAppButton';
 import { ProjectActionsButton } from '@/components/layout/ProjectActionsButton';
-import { isDesktopShell, isVSCodeRuntime } from '@/lib/desktop';
+import { isDesktopShell, isVSCodeRuntime, startDesktopWindowDrag } from '@/lib/desktop';
 import { desktopHostsGet, locationMatchesHost, redactSensitiveUrl } from '@/lib/desktopHosts';
 import { resolveSessionDiffStats } from '@/components/session/sidebar/utils';
 import type { Session } from '@opencode-ai/sdk/v2/client';
@@ -1405,13 +1405,7 @@ export const Header: React.FC<HeaderProps> = ({
       return;
     }
     if (isDesktopApp) {
-      try {
-        const { getCurrentWindow } = await import('@tauri-apps/api/window');
-        const window = getCurrentWindow();
-        await window.startDragging();
-      } catch (error) {
-        console.error('Failed to start window dragging:', error);
-      }
+      await startDesktopWindowDrag();
     }
   }, [isDesktopApp]);
 

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

@@ -1,7 +1,7 @@
 import React from 'react';
 import { cn } from '@/lib/utils';
 import { useUIStore } from '@/stores/useUIStore';
-import { isDesktopShell } from '@/lib/desktop';
+import { isDesktopShell, startDesktopWindowDrag } from '@/lib/desktop';
 
 export const RIGHT_SIDEBAR_CONTENT_WIDTH = 420;
 const RIGHT_SIDEBAR_MIN_WIDTH = 400;
@@ -123,13 +123,7 @@ export const RightSidebar: React.FC<RightSidebarProps> = ({ isOpen, children, cl
       return;
     }
 
-    try {
-      const { getCurrentWindow } = await import('@tauri-apps/api/window');
-      const appWindow = getCurrentWindow();
-      await appWindow.startDragging();
-    } catch (error) {
-      console.error('Failed to start window dragging:', error);
-    }
+    await startDesktopWindowDrag();
   }, [isDesktopApp]);
 
   return (

packages/ui/src/components/multirun/MultiRunLauncher.tsx

@@ -19,7 +19,7 @@ import type { CreateMultiRunParams, MultiRunModelSelection } from '@/types/multi
 import { ModelMultiSelect, generateInstanceId, type ModelSelectionWithId } from './ModelMultiSelect';
 import { BranchSelector, useBranchOptions } from './BranchSelector';
 import { AgentSelector } from './AgentSelector';
-import { isDesktopShell } from '@/lib/desktop';
+import { isDesktopShell, startDesktopWindowDrag } from '@/lib/desktop';
 import { useThemeSystem } from '@/contexts/useThemeSystem';
 import { PROJECT_ICON_MAP, PROJECT_COLOR_MAP, getProjectIconImageUrl } from '@/lib/projectMeta';
 import type { ProjectEntry } from '@/lib/api/types';
@@ -266,13 +266,7 @@ export const MultiRunLauncher: React.FC<MultiRunLauncherProps> = ({
       return;
     }
     if (isDesktopApp) {
-      try {
-        const { getCurrentWindow } = await import('@tauri-apps/api/window');
-        const window = getCurrentWindow();
-        await window.startDragging();
-      } catch {
-        // ignore
-      }
+      await startDesktopWindowDrag();
     }
   }, [isDesktopApp]);
 

packages/ui/src/components/onboarding/OnboardingScreen.tsx

@@ -1,6 +1,6 @@
 import React from 'react';
 import { RiFileCopyLine, RiCheckLine, RiExternalLinkLine } from '@remixicon/react';
-import { isDesktopShell, isTauriShell } from '@/lib/desktop';
+import { isDesktopShell, isTauriShell, startDesktopWindowDrag } from '@/lib/desktop';
 import { Input } from '@/components/ui/input';
 import { Button } from '@/components/ui/button';
 import { updateDesktopSettings } from '@/lib/persistence';
@@ -105,14 +105,8 @@ export function OnboardingScreen({ onCliAvailable }: OnboardingScreenProps) {
       return;
     }
     if (e.button !== 0) return;
-    if (isDesktopApp && isTauriShell()) {
-      try {
-        const { getCurrentWindow } = await import('@tauri-apps/api/window');
-        const window = getCurrentWindow();
-        await window.startDragging();
-      } catch (error) {
-        console.error('Failed to start window dragging:', error);
-      }
+    if (isDesktopApp) {
+      await startDesktopWindowDrag();
     }
   }, [isDesktopApp]);
 

packages/ui/src/components/session/SessionSidebar.tsx

@@ -3,7 +3,7 @@ import type { Session } from '@opencode-ai/sdk/v2';
 import { RiLayoutLeftLine } from '@remixicon/react';
 import { toast } from '@/components/ui';
 import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip';
-import { isDesktopLocalOriginActive, isDesktopShell, isTauriShell } from '@/lib/desktop';
+import { isDesktopLocalOriginActive, isDesktopShell, isTauriShell, startDesktopWindowDrag } from '@/lib/desktop';
 import { MobileOverlayPanel } from '@/components/ui/MobileOverlayPanel';
 import { sessionEvents } from '@/lib/sessionEvents';
 import { formatDirectoryName, cn } from '@/lib/utils';
@@ -490,13 +490,7 @@ export const SessionSidebar: React.FC<SessionSidebarProps> = ({
       return;
     }
 
-    try {
-      const { getCurrentWindow } = await import('@tauri-apps/api/window');
-      const appWindow = getCurrentWindow();
-      await appWindow.startDragging();
-    } catch (error) {
-      console.error('Failed to start window dragging:', error);
-    }
+    await startDesktopWindowDrag();
   }, [isDesktopShellRuntime]);
 
   const {

packages/ui/src/lib/desktop.ts

@@ -242,6 +242,21 @@ export const isDesktopShell = (): boolean => {
   return isTauriShell();
 };
 
+export const startDesktopWindowDrag = async (): Promise<boolean> => {
+  if (!isDesktopShell() || !isTauriShell()) {
+    return false;
+  }
+
+  try {
+    const { getCurrentWindow } = await import('@tauri-apps/api/window');
+    const appWindow = getCurrentWindow();
+    await appWindow.startDragging();
+    return true;
+  } catch {
+    return false;
+  }
+};
+
 export const isVSCodeRuntime = (): boolean => {
   if (typeof window === "undefined") return false;
   const apis = (window as { __OPENCHAMBER_RUNTIME_APIS__?: { runtime?: { isVSCode?: boolean } } }).__OPENCHAMBER_RUNTIME_APIS__;