diff --git a/packages/ui/src/components/chat/ChatMessage.tsx b/packages/ui/src/components/chat/ChatMessage.tsx
index 32db1ac8..42b8a851 100644
--- a/packages/ui/src/components/chat/ChatMessage.tsx
+++ b/packages/ui/src/components/chat/ChatMessage.tsx
@@ -25,6 +25,7 @@ import { flattenAssistantTextParts } from '@/lib/messages/messageText';
 import { isLikelyProviderAuthFailure, PROVIDER_AUTH_FAILURE_MESSAGE } from '@/lib/messages/providerAuthError';
 import { FadeInOnReveal } from './message/FadeInOnReveal';
 import type { TurnGroupingContext } from './hooks/useTurnGrouping';
+import { copyTextToClipboard } from '@/lib/clipboard';
 
 const ToolOutputDialog = React.lazy(() => import('./message/ToolOutputDialog'));
 
@@ -578,9 +579,13 @@ const ChatMessage: React.FC<ChatMessageProps> = ({
     }, [isUser, previousRole, turnGroupingContext, streamPhase, message.info]);
 
     const handleCopyCode = React.useCallback((code: string) => {
-        navigator.clipboard.writeText(code);
-        setCopiedCode(code);
-        setTimeout(() => setCopiedCode(null), 2000);
+        void copyTextToClipboard(code).then((result) => {
+            if (!result.ok) {
+                return;
+            }
+            setCopiedCode(code);
+            setTimeout(() => setCopiedCode(null), 2000);
+        });
     }, []);
 
     const userMessageIdForTurn = turnGroupingContext?.turnId;
@@ -704,46 +709,14 @@ const ChatMessage: React.FC<ChatMessageProps> = ({
 
     const hasTextContent = messageTextContent.length > 0;
 
-    const copyTextToClipboard = React.useCallback(async (text: string): Promise<boolean> => {
-        if (!text) {
-            return false;
-        }
-
-        if (typeof navigator !== 'undefined' && navigator.clipboard && typeof window !== 'undefined' && window.isSecureContext) {
-            try {
-                await navigator.clipboard.writeText(text);
-                return true;
-            } catch (error) {
-                void error;
-            }
-        }
-
-        if (typeof document === 'undefined') {
-            return false;
-        }
-
-        const textarea = document.createElement('textarea');
-        textarea.value = text;
-        textarea.setAttribute('readonly', '');
-        textarea.style.position = 'fixed';
-        textarea.style.top = '-1000px';
-        textarea.style.left = '-1000px';
-        document.body.appendChild(textarea);
-        textarea.select();
-        textarea.setSelectionRange(0, textarea.value.length);
-        const succeeded = document.execCommand('copy');
-        document.body.removeChild(textarea);
-        return succeeded;
-    }, []);
-
     const handleCopyMessage = React.useCallback(async () => {
-        const didCopy = await copyTextToClipboard(messageTextContent);
-        if (!didCopy) {
+        const result = await copyTextToClipboard(messageTextContent);
+        if (!result.ok) {
             return;
         }
         setCopiedMessage(true);
         setTimeout(() => setCopiedMessage(false), 2000);
-    }, [copyTextToClipboard, messageTextContent]);
+    }, [messageTextContent]);
 
     const handleRevert = React.useCallback(() => {
         if (!sessionId || !message.info.id) return;
diff --git a/packages/ui/src/components/chat/MarkdownRenderer.tsx b/packages/ui/src/components/chat/MarkdownRenderer.tsx
index 94f49910..eaae1f95 100644
--- a/packages/ui/src/components/chat/MarkdownRenderer.tsx
+++ b/packages/ui/src/components/chat/MarkdownRenderer.tsx
@@ -8,6 +8,7 @@ import type { Part } from '@opencode-ai/sdk/v2';
 import { cn } from '@/lib/utils';
 import { RiFileCopyLine, RiCheckLine, RiDownloadLine } from '@remixicon/react';
 import { toast } from '@/components/ui';
+import { copyTextToClipboard } from '@/lib/clipboard';
 
 import { isVSCodeRuntime } from '@/lib/desktop';
 import { useOptionalThemeSystem } from '@/contexts/useThemeSystem';
@@ -262,9 +263,10 @@ const TableCopyButton: React.FC<{ tableRef: React.RefObject<HTMLDivElement | nul
     const tableEl = tableRef.current?.querySelector('table');
     if (!tableEl) return;
     
+    const data = extractTableData(tableEl);
+    const content = format === 'csv' ? tableToCSV(data) : tableToTSV(data);
+
     try {
-      const data = extractTableData(tableEl);
-      const content = format === 'csv' ? tableToCSV(data) : tableToTSV(data);
       await navigator.clipboard.write([
         new ClipboardItem({
           'text/plain': new Blob([content], { type: 'text/plain' }),
@@ -275,6 +277,13 @@ const TableCopyButton: React.FC<{ tableRef: React.RefObject<HTMLDivElement | nul
       setShowMenu(false);
       setTimeout(() => setCopied(false), 2000);
     } catch (err) {
+      const fallbackResult = await copyTextToClipboard(content);
+      if (fallbackResult.ok) {
+        setCopied(true);
+        setShowMenu(false);
+        setTimeout(() => setCopied(false), 2000);
+        return;
+      }
       console.error('Failed to copy table:', err);
     }
   };
@@ -481,12 +490,12 @@ const CodeBlockWrapper: React.FC<CodeBlockWrapperProps> = ({ children, className
   const handleCopy = async () => {
     const code = getCodeContent();
     if (!code) return;
-    try {
-      await navigator.clipboard.writeText(code);
+    const result = await copyTextToClipboard(code);
+    if (result.ok) {
       setCopied(true);
       setTimeout(() => setCopied(false), 2000);
-    } catch (err) {
-      console.error('Failed to copy:', err);
+    } else {
+      console.error('Failed to copy:', result.error);
     }
   };
 
@@ -539,12 +548,12 @@ const MermaidCopyButton: React.FC<{ source: string }> = ({ source }) => {
 
   const handleCopy = async () => {
     if (!source) return;
-    try {
-      await navigator.clipboard.writeText(source);
+    const result = await copyTextToClipboard(source);
+    if (result.ok) {
       setCopied(true);
       setTimeout(() => setCopied(false), 2000);
-    } catch (err) {
-      console.error('Failed to copy diagram:', err);
+    } else {
+      console.error('Failed to copy diagram:', result.error);
     }
   };
 
diff --git a/packages/ui/src/components/chat/message/MessageBody.tsx b/packages/ui/src/components/chat/message/MessageBody.tsx
index f8c62fbb..83f0168d 100644
--- a/packages/ui/src/components/chat/message/MessageBody.tsx
+++ b/packages/ui/src/components/chat/message/MessageBody.tsx
@@ -27,6 +27,7 @@ import { MULTIRUN_EXECUTION_FORK_PROMPT_META_TEXT } from '@/lib/messages/executi
 import { useMessageTTS } from '@/hooks/useMessageTTS';
 import { useConfigStore } from '@/stores/useConfigStore';
 import { TextSelectionMenu } from './TextSelectionMenu';
+import { copyTextToClipboard } from '@/lib/clipboard';
 
 type SubtaskPartLike = Part & {
     type: 'subtask';
@@ -165,32 +166,8 @@ const UserShellActionPart: React.FC<{ part: ShellActionPartLike }> = ({ part })
     const copyOutputToClipboard = React.useCallback(async () => {
         if (!hasOutput) return;
 
-        let succeeded = false;
-
-        if (typeof navigator !== 'undefined' && navigator.clipboard && typeof window !== 'undefined' && window.isSecureContext) {
-            try {
-                await navigator.clipboard.writeText(output);
-                succeeded = true;
-            } catch {
-                succeeded = false;
-            }
-        }
-
-        if (!succeeded && typeof document !== 'undefined') {
-            const textarea = document.createElement('textarea');
-            textarea.value = output;
-            textarea.setAttribute('readonly', '');
-            textarea.style.position = 'fixed';
-            textarea.style.top = '-1000px';
-            textarea.style.left = '-1000px';
-            document.body.appendChild(textarea);
-            textarea.select();
-            textarea.setSelectionRange(0, textarea.value.length);
-            succeeded = document.execCommand('copy');
-            document.body.removeChild(textarea);
-        }
-
-        if (!succeeded) return;
+        const result = await copyTextToClipboard(output);
+        if (!result.ok) return;
 
         clearCopiedResetTimeout();
         setCopiedOutput(true);
diff --git a/packages/ui/src/components/chat/message/TextSelectionMenu.tsx b/packages/ui/src/components/chat/message/TextSelectionMenu.tsx
index 737e4c87..eb4c777c 100644
--- a/packages/ui/src/components/chat/message/TextSelectionMenu.tsx
+++ b/packages/ui/src/components/chat/message/TextSelectionMenu.tsx
@@ -4,6 +4,7 @@ import { useSessionStore } from '@/stores/useSessionStore';
 import { useUIStore } from '@/stores/useUIStore';
 import { RiChatNewLine, RiAddLine, RiFileCopyLine } from '@remixicon/react';
 import { cn } from '@/lib/utils';
+import { copyTextToClipboard } from '@/lib/clipboard';
 
 interface TextSelectionMenuProps {
   containerRef: React.RefObject<HTMLElement | null>;
@@ -223,10 +224,9 @@ export const TextSelectionMenu: React.FC<TextSelectionMenuProps> = ({ containerR
   const handleCopy = React.useCallback(async () => {
     if (!selectedText) return;
 
-    try {
-      await navigator.clipboard.writeText(selectedText);
-    } catch (err) {
-      console.error('Failed to copy:', err);
+    const result = await copyTextToClipboard(selectedText);
+    if (!result.ok) {
+      console.error('Failed to copy:', result.error);
     }
 
     hideMenu();
diff --git a/packages/ui/src/components/desktop/OpenInAppButton.tsx b/packages/ui/src/components/desktop/OpenInAppButton.tsx
index e8f52660..c527afbe 100644
--- a/packages/ui/src/components/desktop/OpenInAppButton.tsx
+++ b/packages/ui/src/components/desktop/OpenInAppButton.tsx
@@ -8,6 +8,7 @@ import {
 } from '@/components/ui/dropdown-menu';
 import { toast } from '@/components/ui';
 import { updateDesktopSettings } from '@/lib/persistence';
+import { copyTextToClipboard } from '@/lib/clipboard';
 import { cn } from '@/lib/utils';
 import { fetchDesktopInstalledApps, isDesktopLocalOriginActive, isTauriShell, openDesktopPath, type DesktopSettings, type InstalledDesktopAppInfo } from '@/lib/desktop';
 import { RiArrowDownSLine, RiCheckLine, RiFileCopyLine, RiRefreshLine } from '@remixicon/react';
@@ -302,29 +303,9 @@ export const OpenInAppButton = ({ directory, className }: OpenInAppButtonProps)
   };
 
   const handleCopyPath = async () => {
-    if (typeof navigator === 'undefined') return;
     const text = directory;
-    let copied = false;
-    if (navigator.clipboard?.writeText) {
-      try {
-        await navigator.clipboard.writeText(text);
-        copied = true;
-      } catch {
-        // fall through
-      }
-    }
-    if (!copied) {
-      const textarea = document.createElement('textarea');
-      textarea.value = text;
-      textarea.setAttribute('readonly', '');
-      textarea.style.position = 'absolute';
-      textarea.style.left = '-9999px';
-      document.body.appendChild(textarea);
-      textarea.select();
-      copied = document.execCommand('copy');
-      document.body.removeChild(textarea);
-    }
-    if (!copied) {
+    const result = await copyTextToClipboard(text);
+    if (!result.ok) {
       return;
     }
     toast.success('Path copied to clipboard');
diff --git a/packages/ui/src/components/layout/ContextSidebarTab.tsx b/packages/ui/src/components/layout/ContextSidebarTab.tsx
index 963c519d..b8550424 100644
--- a/packages/ui/src/components/layout/ContextSidebarTab.tsx
+++ b/packages/ui/src/components/layout/ContextSidebarTab.tsx
@@ -8,6 +8,7 @@ import { useThemeSystem } from '@/contexts/useThemeSystem';
 import { generateSyntaxTheme } from '@/lib/theme/syntaxThemeGenerator';
 import { useConfigStore } from '@/stores/useConfigStore';
 import { useSessionStore } from '@/stores/useSessionStore';
+import { copyTextToClipboard } from '@/lib/clipboard';
 
 type SessionMessage = { info: Message; parts: Part[] };
 
@@ -303,8 +304,8 @@ export const ContextPanelContent: React.FC = () => {
   }, []);
 
   const handleCopyRawMessage = React.useCallback(async (messageId: string, value: string) => {
-    try {
-      await navigator.clipboard.writeText(value);
+    const result = await copyTextToClipboard(value);
+    if (result.ok) {
       setCopiedRawMessageId(messageId);
       if (copyResetTimeoutRef.current !== null) {
         window.clearTimeout(copyResetTimeoutRef.current);
@@ -313,7 +314,7 @@ export const ContextPanelContent: React.FC = () => {
         setCopiedRawMessageId((prev) => (prev === messageId ? null : prev));
         copyResetTimeoutRef.current = null;
       }, 2000);
-    } catch {
+    } else {
       setCopiedRawMessageId(null);
     }
   }, []);
diff --git a/packages/ui/src/components/layout/SidebarFilesTree.tsx b/packages/ui/src/components/layout/SidebarFilesTree.tsx
index bdb1a006..9df244bb 100644
--- a/packages/ui/src/components/layout/SidebarFilesTree.tsx
+++ b/packages/ui/src/components/layout/SidebarFilesTree.tsx
@@ -45,6 +45,7 @@ import { useUIStore } from '@/stores/useUIStore';
 import { useGitStatus } from '@/stores/useGitStore';
 import { useDirectoryShowHidden } from '@/lib/directoryShowHidden';
 import { useFilesViewShowGitignored } from '@/lib/filesViewShowGitignored';
+import { copyTextToClipboard } from '@/lib/clipboard';
 import { cn } from '@/lib/utils';
 import { opencodeClient } from '@/lib/opencode/client';
 
@@ -286,8 +287,13 @@ const FileRow: React.FC<FileRowProps> = ({
               )}
               <DropdownMenuItem onClick={(e) => {
                 e.stopPropagation();
-                void navigator.clipboard.writeText(node.path);
-                toast.success('Path copied');
+                void copyTextToClipboard(node.path).then((result) => {
+                  if (result.ok) {
+                    toast.success('Path copied');
+                    return;
+                  }
+                  toast.error('Copy failed');
+                });
               }}>
                 <RiFileCopyLine className="mr-2 h-4 w-4" /> Copy Path
               </DropdownMenuItem>
diff --git a/packages/ui/src/components/onboarding/OnboardingScreen.tsx b/packages/ui/src/components/onboarding/OnboardingScreen.tsx
index 3c771b6d..59b31f9b 100644
--- a/packages/ui/src/components/onboarding/OnboardingScreen.tsx
+++ b/packages/ui/src/components/onboarding/OnboardingScreen.tsx
@@ -4,6 +4,7 @@ import { isDesktopShell, isTauriShell } from '@/lib/desktop';
 import { Input } from '@/components/ui/input';
 import { Button } from '@/components/ui/button';
 import { updateDesktopSettings } from '@/lib/persistence';
+import { copyTextToClipboard } from '@/lib/clipboard';
 
 const INSTALL_COMMAND = 'curl -fsSL https://opencode.ai/install | bash';
 const POLL_INTERVAL_MS = 3000;
@@ -146,12 +147,12 @@ export function OnboardingScreen({ onCliAvailable }: OnboardingScreenProps) {
   }, [opencodeBinary]);
 
   const handleCopy = React.useCallback(async () => {
-    try {
-      await navigator.clipboard.writeText(INSTALL_COMMAND);
+    const result = await copyTextToClipboard(INSTALL_COMMAND);
+    if (result.ok) {
       setCopied(true);
       setTimeout(() => setCopied(false), 2000);
-    } catch (err) {
-      console.error('Failed to copy:', err);
+    } else {
+      console.error('Failed to copy:', result.error);
     }
   }, []);
 
diff --git a/packages/ui/src/components/sections/providers/ProvidersPage.tsx b/packages/ui/src/components/sections/providers/ProvidersPage.tsx
index c5354a6a..0bae9789 100644
--- a/packages/ui/src/components/sections/providers/ProvidersPage.tsx
+++ b/packages/ui/src/components/sections/providers/ProvidersPage.tsx
@@ -14,6 +14,7 @@ import { toast } from '@/components/ui';
 import { RiStackLine, RiToolsLine, RiBrainAi3Line, RiFileImageLine, RiArrowDownSLine, RiCheckLine, RiSearchLine } from '@remixicon/react';
 import { reloadOpenCodeConfiguration } from '@/stores/useAgentsStore';
 import { cn } from '@/lib/utils';
+import { copyTextToClipboard } from '@/lib/clipboard';
 import type { ModelMetadata } from '@/types';
 
 const COMPACT_NUMBER_FORMATTER = new Intl.NumberFormat('en-US', {
@@ -448,23 +449,23 @@ export const ProvidersPage: React.FC = () => {
   };
 
   const handleCopyOAuthLink = async (url: string) => {
-    try {
-      await navigator.clipboard.writeText(url);
+    const result = await copyTextToClipboard(url);
+    if (result.ok) {
       toast.success('OAuth link copied');
-    } catch (error) {
-      console.error('Failed to copy OAuth link:', error);
-      toast.error('Failed to copy OAuth link');
+      return;
     }
+    console.error('Failed to copy OAuth link:', result.error);
+    toast.error('Failed to copy OAuth link');
   };
 
   const handleCopyOAuthCode = async (code: string) => {
-    try {
-      await navigator.clipboard.writeText(code);
+    const result = await copyTextToClipboard(code);
+    if (result.ok) {
       toast.success('Device code copied');
-    } catch (error) {
-      console.error('Failed to copy device code:', error);
-      toast.error('Failed to copy device code');
+      return;
     }
+    console.error('Failed to copy device code:', result.error);
+    toast.error('Failed to copy device code');
   };
 
   const handleDisconnectProvider = async (providerId: string) => {
diff --git a/packages/ui/src/components/session/SessionSidebar.tsx b/packages/ui/src/components/session/SessionSidebar.tsx
index e9f5e365..a4ee7662 100644
--- a/packages/ui/src/components/session/SessionSidebar.tsx
+++ b/packages/ui/src/components/session/SessionSidebar.tsx
@@ -1,6 +1,7 @@
 import React from 'react';
 import type { Session } from '@opencode-ai/sdk/v2';
 import { toast } from '@/components/ui';
+import { copyTextToClipboard } from '@/lib/clipboard';
 import { isDesktopLocalOriginActive, isDesktopShell, isTauriShell } from '@/lib/desktop';
 import {
   DndContext,
@@ -1039,9 +1040,12 @@ export const SessionSidebar: React.FC<SessionSidebarProps> = ({
   );
 
   const handleCopyShareUrl = React.useCallback((url: string, sessionId: string) => {
-    navigator.clipboard
-      .writeText(url)
-      .then(() => {
+    void copyTextToClipboard(url)
+      .then((result) => {
+        if (!result.ok) {
+          toast.error('Failed to copy URL');
+          return;
+        }
         setCopiedSessionId(sessionId);
         if (copyTimeout.current) {
           clearTimeout(copyTimeout.current);
diff --git a/packages/ui/src/components/terminal/TerminalViewport.tsx b/packages/ui/src/components/terminal/TerminalViewport.tsx
index b7e4ea7b..663b61e0 100644
--- a/packages/ui/src/components/terminal/TerminalViewport.tsx
+++ b/packages/ui/src/components/terminal/TerminalViewport.tsx
@@ -6,6 +6,7 @@ import { isMobileDeviceViaCSS } from '@/lib/device';
 import type { TerminalTheme } from '@/lib/terminalTheme';
 import { getGhosttyTerminalOptions } from '@/lib/terminalTheme';
 import type { TerminalChunk } from '@/stores/useTerminalStore';
+import { copyTextToClipboard } from '@/lib/clipboard';
 import { cn } from '@/lib/utils';
 import { OverlayScrollbar } from '@/components/ui/OverlayScrollbar';
 
@@ -391,29 +392,7 @@ const TerminalViewport = React.forwardRef<TerminalController, TerminalViewportPr
         return;
       }
 
-      if (navigator.clipboard?.writeText) {
-        const copied = await navigator.clipboard
-          .writeText(text)
-          .then(() => true)
-          .catch(() => false);
-        if (copied) {
-          return;
-        }
-      }
-
-      try {
-        const textarea = document.createElement('textarea');
-        textarea.value = text;
-        textarea.style.position = 'fixed';
-        textarea.style.opacity = '0';
-        document.body.appendChild(textarea);
-        textarea.focus();
-        textarea.select();
-        document.execCommand('copy');
-        document.body.removeChild(textarea);
-      } catch {
-        return;
-      }
+      await copyTextToClipboard(text);
     }, [getDomSelectionTextInViewport, getTerminalSelectionText]);
 
     const hasCopyableSelectionInViewport = React.useCallback((): boolean => {
diff --git a/packages/ui/src/components/ui/AboutDialog.tsx b/packages/ui/src/components/ui/AboutDialog.tsx
index bfdd78bd..8044d792 100644
--- a/packages/ui/src/components/ui/AboutDialog.tsx
+++ b/packages/ui/src/components/ui/AboutDialog.tsx
@@ -23,18 +23,29 @@ export const AboutDialog: React.FC<AboutDialogProps> = ({
   const [version, setVersion] = React.useState<string | null>(null);
   const [isCopyingDiagnostics, setIsCopyingDiagnostics] = React.useState(false);
   const [copiedDiagnostics, setCopiedDiagnostics] = React.useState(false);
+  const [diagnosticsReport, setDiagnosticsReport] = React.useState<string | null>(null);
+  const [isPreparingDiagnostics, setIsPreparingDiagnostics] = React.useState(false);
 
   const handleCopyDiagnostics = React.useCallback(async () => {
     if (isCopyingDiagnostics) return;
     setIsCopyingDiagnostics(true);
     setCopiedDiagnostics(false);
     try {
-      const result = await debugUtils.copyDiagnosticsReport();
+      if (!diagnosticsReport) {
+        toast.error('Copy failed', {
+          description: 'Diagnostics not ready yet. Wait a second and retry.',
+        });
+        return;
+      }
+
+      const result = await debugUtils.copyTextToClipboard(diagnosticsReport);
       if (result.ok) {
         setCopiedDiagnostics(true);
         toast.success('Diagnostics copied');
       } else {
-        toast.error('Copy failed');
+        toast.error('Copy failed', {
+          description: result.error,
+        });
       }
     } catch (error) {
       toast.error('Copy failed');
@@ -42,7 +53,7 @@ export const AboutDialog: React.FC<AboutDialogProps> = ({
     } finally {
       setIsCopyingDiagnostics(false);
     }
-  }, [isCopyingDiagnostics]);
+  }, [diagnosticsReport, isCopyingDiagnostics]);
 
   React.useEffect(() => {
     if (!open) return;
@@ -65,6 +76,35 @@ export const AboutDialog: React.FC<AboutDialogProps> = ({
     }
   }, [open]);
 
+  React.useEffect(() => {
+    if (!open) {
+      setDiagnosticsReport(null);
+      setIsPreparingDiagnostics(false);
+      return;
+    }
+
+    let cancelled = false;
+    setIsPreparingDiagnostics(true);
+    void debugUtils.buildDiagnosticsReport()
+      .then((report) => {
+        if (cancelled) return;
+        setDiagnosticsReport(report);
+      })
+      .catch((error) => {
+        if (cancelled) return;
+        console.error('Failed to prepare diagnostics:', error);
+        setDiagnosticsReport(null);
+      })
+      .finally(() => {
+        if (cancelled) return;
+        setIsPreparingDiagnostics(false);
+      });
+
+    return () => {
+      cancelled = true;
+    };
+  }, [open]);
+
   const displayVersion = version;
 
   return (
@@ -98,14 +138,18 @@ export const AboutDialog: React.FC<AboutDialogProps> = ({
           <div className="flex flex-col items-center gap-2 pt-2">
             <button
               onClick={handleCopyDiagnostics}
-              disabled={isCopyingDiagnostics}
+              disabled={isCopyingDiagnostics || isPreparingDiagnostics || !diagnosticsReport}
               className={cn(
                 'typography-meta text-muted-foreground hover:text-foreground',
                 'underline-offset-2 hover:underline',
                 'disabled:opacity-50 disabled:cursor-not-allowed'
               )}
             >
-              {copiedDiagnostics ? 'Diagnostics copied' : 'Copy diagnostics'}
+              {copiedDiagnostics
+                ? 'Diagnostics copied'
+                : isPreparingDiagnostics
+                  ? 'Preparing diagnostics...'
+                  : 'Copy diagnostics'}
             </button>
             <p className="typography-micro text-muted-foreground">
               Includes OpenChamber state, OpenCode health, directories, and projects.
diff --git a/packages/ui/src/components/ui/ErrorBoundary.tsx b/packages/ui/src/components/ui/ErrorBoundary.tsx
index 4101991b..c6b4c426 100644
--- a/packages/ui/src/components/ui/ErrorBoundary.tsx
+++ b/packages/ui/src/components/ui/ErrorBoundary.tsx
@@ -2,6 +2,7 @@ import React from 'react';
 import { RiErrorWarningLine, RiRestartLine } from '@remixicon/react';
 import { Button } from './button';
 import { Card, CardContent, CardHeader, CardTitle } from './card';
+import { copyTextToClipboard } from '@/lib/clipboard';
 
 interface ErrorBoundaryState {
   hasError: boolean;
@@ -41,14 +42,12 @@ export class ErrorBoundary extends React.Component<ErrorBoundaryProps, ErrorBoun
     const componentStack = this.state.errorInfo?.componentStack ? `\n\nComponent stack:${this.state.errorInfo.componentStack}` : '';
     const payload = `${errorText}${stack}${componentStack}`;
 
-    try {
-      await navigator.clipboard.writeText(payload);
+    const result = await copyTextToClipboard(payload);
+    if (result.ok) {
       this.setState({ copied: true });
       window.setTimeout(() => {
         this.setState((prev) => (prev.copied ? { copied: false } : null));
       }, 1500);
-    } catch {
-      // ignore
     }
   };
 
diff --git a/packages/ui/src/components/ui/OpenCodeStatusDialog.tsx b/packages/ui/src/components/ui/OpenCodeStatusDialog.tsx
index a3577200..9929fb78 100644
--- a/packages/ui/src/components/ui/OpenCodeStatusDialog.tsx
+++ b/packages/ui/src/components/ui/OpenCodeStatusDialog.tsx
@@ -8,6 +8,7 @@ import {
 } from '@/components/ui/dialog';
 import { toast } from '@/components/ui';
 import { useUIStore } from '@/stores/useUIStore';
+import { copyTextToClipboard } from '@/lib/clipboard';
 
 export const OpenCodeStatusDialog: React.FC = () => {
   const {
@@ -16,19 +17,17 @@ export const OpenCodeStatusDialog: React.FC = () => {
     openCodeStatusText,
   } = useUIStore();
 
-  const handleCopy = React.useCallback(() => {
+  const handleCopy = React.useCallback(async () => {
     if (!openCodeStatusText) {
       return;
     }
 
-    void navigator.clipboard
-      .writeText(openCodeStatusText)
-      .then(() => {
-        toast.success('Copied', { description: 'OpenCode status copied to clipboard.' });
-      })
-      .catch(() => {
-        toast.error('Copy failed');
-      });
+    const result = await copyTextToClipboard(openCodeStatusText);
+    if (result.ok) {
+      toast.success('Copied', { description: 'OpenCode status copied to clipboard.' });
+      return;
+    }
+    toast.error('Copy failed');
   }, [openCodeStatusText]);
 
   return (
diff --git a/packages/ui/src/components/ui/UpdateDialog.tsx b/packages/ui/src/components/ui/UpdateDialog.tsx
index 92fb2f06..02743f2b 100644
--- a/packages/ui/src/components/ui/UpdateDialog.tsx
+++ b/packages/ui/src/components/ui/UpdateDialog.tsx
@@ -10,6 +10,7 @@ import { SimpleMarkdownRenderer } from '@/components/chat/MarkdownRenderer';
 import { RiCheckLine, RiClipboardLine, RiDownloadCloudLine, RiDownloadLine, RiExternalLinkLine, RiLoaderLine, RiRestartLine, RiTerminalLine } from '@remixicon/react';
 import { cn } from '@/lib/utils';
 import type { UpdateInfo, UpdateProgress } from '@/lib/desktop';
+import { copyTextToClipboard } from '@/lib/clipboard';
 
 type WebUpdateState = 'idle' | 'updating' | 'restarting' | 'reconnecting' | 'error';
 
@@ -172,11 +173,11 @@ export const UpdateDialog: React.FC<UpdateDialogProps> = ({
   }, [open]);
 
   const handleCopyCommand = async () => {
-    try {
-      await navigator.clipboard.writeText(updateCommand);
+    const result = await copyTextToClipboard(updateCommand);
+    if (result.ok) {
       setCopied(true);
       setTimeout(() => setCopied(false), 2000);
-    } catch {
+    } else {
       // Clipboard access denied
     }
   };
diff --git a/packages/ui/src/components/ui/toast.ts b/packages/ui/src/components/ui/toast.ts
index 002fa69e..f2694c16 100644
--- a/packages/ui/src/components/ui/toast.ts
+++ b/packages/ui/src/components/ui/toast.ts
@@ -3,12 +3,12 @@
 import { isValidElement } from "react"
 import { toast as sonnerToast } from "sonner"
 import type { ExternalToast } from "sonner"
+import { copyTextToClipboard } from '@/lib/clipboard'
 
 const copyToClipboard = async (text: string) => {
-  try {
-    await navigator.clipboard.writeText(text)
-  } catch (err) {
-    console.error('Failed to copy to clipboard:', err)
+  const result = await copyTextToClipboard(text)
+  if (!result.ok) {
+    console.error('Failed to copy to clipboard:', result.error)
   }
 }
 
diff --git a/packages/ui/src/components/views/FilesView.tsx b/packages/ui/src/components/views/FilesView.tsx
index 80146cfe..af93130b 100644
--- a/packages/ui/src/components/views/FilesView.tsx
+++ b/packages/ui/src/components/views/FilesView.tsx
@@ -27,6 +27,7 @@ import {
   RiFileCopyLine,
 } from '@remixicon/react';
 import { toast } from '@/components/ui';
+import { copyTextToClipboard } from '@/lib/clipboard';
 
 import {
   DropdownMenu,
@@ -447,8 +448,13 @@ const FileRow: React.FC<FileRowProps> = ({
               )}
               <DropdownMenuItem onClick={(e) => {
                 e.stopPropagation();
-                void navigator.clipboard.writeText(node.path);
-                toast.success('Path copied');
+                void copyTextToClipboard(node.path).then((result) => {
+                  if (result.ok) {
+                    toast.success('Path copied');
+                    return;
+                  }
+                  toast.error('Copy failed');
+                });
               }}>
                 <RiFileCopyLine className="mr-2 h-4 w-4" /> Copy Path
               </DropdownMenuItem>
@@ -2049,8 +2055,8 @@ export const FilesView: React.FC<FilesViewProps> = ({ mode = 'full' }) => {
                 variant="ghost"
                 size="sm"
                 onClick={async () => {
-                  try {
-                    await navigator.clipboard.writeText(fileContent);
+                  const result = await copyTextToClipboard(fileContent);
+                  if (result.ok) {
                     setCopiedContent(true);
                     if (copiedContentTimeoutRef.current !== null) {
                       window.clearTimeout(copiedContentTimeoutRef.current);
@@ -2058,7 +2064,7 @@ export const FilesView: React.FC<FilesViewProps> = ({ mode = 'full' }) => {
                     copiedContentTimeoutRef.current = window.setTimeout(() => {
                       setCopiedContent(false);
                     }, 1200);
-                  } catch {
+                  } else {
                     toast.error('Copy failed');
                   }
                 }}
@@ -2079,8 +2085,8 @@ export const FilesView: React.FC<FilesViewProps> = ({ mode = 'full' }) => {
                 variant="ghost"
                 size="sm"
                 onClick={async () => {
-                  try {
-                    await navigator.clipboard.writeText(displaySelectedPath);
+                  const result = await copyTextToClipboard(displaySelectedPath);
+                  if (result.ok) {
                     setCopiedPath(true);
                     if (copiedPathTimeoutRef.current !== null) {
                       window.clearTimeout(copiedPathTimeoutRef.current);
@@ -2088,7 +2094,7 @@ export const FilesView: React.FC<FilesViewProps> = ({ mode = 'full' }) => {
                     copiedPathTimeoutRef.current = window.setTimeout(() => {
                       setCopiedPath(false);
                     }, 1200);
-                  } catch {
+                  } else {
                     toast.error('Copy failed');
                   }
                 }}
@@ -2437,8 +2443,8 @@ export const FilesView: React.FC<FilesViewProps> = ({ mode = 'full' }) => {
               variant="ghost"
               size="sm"
               onClick={async () => {
-                try {
-                  await navigator.clipboard.writeText(fileContent);
+                const result = await copyTextToClipboard(fileContent);
+                if (result.ok) {
                   setCopiedContent(true);
                   if (copiedContentTimeoutRef.current !== null) {
                     window.clearTimeout(copiedContentTimeoutRef.current);
@@ -2446,7 +2452,7 @@ export const FilesView: React.FC<FilesViewProps> = ({ mode = 'full' }) => {
                   copiedContentTimeoutRef.current = window.setTimeout(() => {
                     setCopiedContent(false);
                   }, 1200);
-                } catch {
+                } else {
                   toast.error('Copy failed');
                 }
               }}
@@ -2467,8 +2473,8 @@ export const FilesView: React.FC<FilesViewProps> = ({ mode = 'full' }) => {
               variant="ghost"
               size="sm"
               onClick={async () => {
-                try {
-                  await navigator.clipboard.writeText(displaySelectedPath);
+                const result = await copyTextToClipboard(displaySelectedPath);
+                if (result.ok) {
                   setCopiedPath(true);
                   if (copiedPathTimeoutRef.current !== null) {
                     window.clearTimeout(copiedPathTimeoutRef.current);
@@ -2476,7 +2482,7 @@ export const FilesView: React.FC<FilesViewProps> = ({ mode = 'full' }) => {
                   copiedPathTimeoutRef.current = window.setTimeout(() => {
                     setCopiedPath(false);
                   }, 1200);
-                } catch {
+                } else {
                   toast.error('Copy failed');
                 }
               }}
diff --git a/packages/ui/src/components/views/GitView.tsx b/packages/ui/src/components/views/GitView.tsx
index ed2aedc9..104b4d8c 100644
--- a/packages/ui/src/components/views/GitView.tsx
+++ b/packages/ui/src/components/views/GitView.tsx
@@ -6,6 +6,7 @@ import { useFireworksCelebration } from '@/contexts/FireworksContext';
 import type { GitIdentityProfile, CommitFileEntry } from '@/lib/api/types';
 import { useGitIdentitiesStore } from '@/stores/useGitIdentitiesStore';
 import { useEffectiveDirectory } from '@/hooks/useEffectiveDirectory';
+import { copyTextToClipboard } from '@/lib/clipboard';
 import {
   useGitStore,
   useGitStatus,
@@ -473,14 +474,13 @@ export const GitView: React.FC<GitViewProps> = ({ mode = 'full' }) => {
   const [stashDialogBranch, setStashDialogBranch] = React.useState('');
 
   const handleCopyCommitHash = React.useCallback((hash: string) => {
-    navigator.clipboard
-      .writeText(hash)
-      .then(() => {
+    void copyTextToClipboard(hash).then((result) => {
+      if (result.ok) {
         toast.success('Commit hash copied');
-      })
-      .catch(() => {
-        toast.error('Failed to copy');
-      });
+        return;
+      }
+      toast.error('Failed to copy');
+    });
   }, []);
 
   const handleToggleCommit = React.useCallback((hash: string) => {
diff --git a/packages/ui/src/components/views/PlanView.tsx b/packages/ui/src/components/views/PlanView.tsx
index 94156afa..2dfd5f86 100644
--- a/packages/ui/src/components/views/PlanView.tsx
+++ b/packages/ui/src/components/views/PlanView.tsx
@@ -21,6 +21,7 @@ import { useRuntimeAPIs } from '@/hooks/useRuntimeAPIs';
 import { EditorView } from '@codemirror/view';
 import { useInlineCommentDraftStore } from '@/stores/useInlineCommentDraftStore';
 import { toast } from '@/components/ui';
+import { copyTextToClipboard } from '@/lib/clipboard';
 
 const normalize = (value: string): string => {
   if (!value) return '';
@@ -428,8 +429,8 @@ export const PlanView: React.FC = () => {
               variant="ghost"
               size="sm"
               onClick={async () => {
-                try {
-                  await navigator.clipboard.writeText(content);
+                const result = await copyTextToClipboard(content);
+                if (result.ok) {
                   setCopiedContent(true);
                   if (copiedContentTimeoutRef.current !== null) {
                     window.clearTimeout(copiedContentTimeoutRef.current);
@@ -437,7 +438,7 @@ export const PlanView: React.FC = () => {
                   copiedContentTimeoutRef.current = window.setTimeout(() => {
                     setCopiedContent(false);
                   }, 1200);
-                } catch {
+                } else {
                   // ignored
                 }
               }}
@@ -455,8 +456,8 @@ export const PlanView: React.FC = () => {
               variant="ghost"
               size="sm"
               onClick={async () => {
-                try {
-                  await navigator.clipboard.writeText(displayPath ?? resolvedPath);
+                const result = await copyTextToClipboard(displayPath ?? resolvedPath);
+                if (result.ok) {
                   setCopiedPath(true);
                   if (copiedTimeoutRef.current !== null) {
                     window.clearTimeout(copiedTimeoutRef.current);
@@ -464,7 +465,7 @@ export const PlanView: React.FC = () => {
                   copiedTimeoutRef.current = window.setTimeout(() => {
                     setCopiedPath(false);
                   }, 1200);
-                } catch {
+                } else {
                   // ignored
                 }
               }}
diff --git a/packages/ui/src/components/views/agent-manager/AgentGroupDetail.tsx b/packages/ui/src/components/views/agent-manager/AgentGroupDetail.tsx
index 25ba6126..de54ead7 100644
--- a/packages/ui/src/components/views/agent-manager/AgentGroupDetail.tsx
+++ b/packages/ui/src/components/views/agent-manager/AgentGroupDetail.tsx
@@ -8,6 +8,7 @@ import {
 } from '@remixicon/react';
 import { toast } from '@/components/ui';
 import { Button } from '@/components/ui/button';
+import { copyTextToClipboard } from '@/lib/clipboard';
 import { cn } from '@/lib/utils';
 import { ProviderLogo } from '@/components/ui/ProviderLogo';
 import { useAgentGroupsStore, type AgentGroup, type AgentGroupSession } from '@/stores/useAgentGroupsStore';
@@ -88,14 +89,13 @@ export const AgentGroupDetail: React.FC<AgentGroupDetailProps> = ({
       toast.error('No worktree path available');
       return;
     }
-    navigator.clipboard
-      .writeText(selectedSession.path)
-      .then(() => {
+    void copyTextToClipboard(selectedSession.path).then((result) => {
+      if (result.ok) {
         toast.success('Worktree path copied');
-      })
-      .catch(() => {
-        toast.error('Failed to copy path');
-      });
+        return;
+      }
+      toast.error('Failed to copy path');
+    });
   }, [selectedSession?.path]);
 
   const handleRemoveSelectedWorktree = React.useCallback(async () => {
diff --git a/packages/ui/src/lib/clipboard.ts b/packages/ui/src/lib/clipboard.ts
new file mode 100644
index 00000000..1002dea6
--- /dev/null
+++ b/packages/ui/src/lib/clipboard.ts
@@ -0,0 +1,39 @@
+export type ClipboardCopyResult =
+  | { ok: true; method: 'clipboard' | 'execCommand' }
+  | { ok: false; error: string };
+
+export async function copyTextToClipboard(text: string): Promise<ClipboardCopyResult> {
+  let clipboardError: string | null = null;
+
+  if (typeof navigator !== 'undefined' && navigator.clipboard?.writeText) {
+    try {
+      await navigator.clipboard.writeText(text);
+      return { ok: true, method: 'clipboard' };
+    } catch (error) {
+      clipboardError = error instanceof Error ? error.message : String(error);
+    }
+  }
+
+  if (typeof document !== 'undefined' && document.body) {
+    const textarea = document.createElement('textarea');
+    textarea.value = text;
+    textarea.setAttribute('readonly', '');
+    textarea.style.position = 'fixed';
+    textarea.style.top = '-1000px';
+    textarea.style.left = '-1000px';
+    document.body.appendChild(textarea);
+    textarea.select();
+    textarea.setSelectionRange(0, textarea.value.length);
+    const copied = document.execCommand('copy');
+    document.body.removeChild(textarea);
+
+    if (copied) {
+      return { ok: true, method: 'execCommand' };
+    }
+  }
+
+  return {
+    ok: false,
+    error: clipboardError ?? 'Clipboard access denied in current context',
+  };
+}
diff --git a/packages/ui/src/lib/debug.ts b/packages/ui/src/lib/debug.ts
index 5e0620a0..9c82de7a 100644
--- a/packages/ui/src/lib/debug.ts
+++ b/packages/ui/src/lib/debug.ts
@@ -5,6 +5,7 @@ import { useProjectsStore } from '@/stores/useProjectsStore';
 import { opencodeClient } from '@/lib/opencode/client';
 import { checkIsGitRepository } from '@/lib/gitApi';
 import { streamDebugEnabled } from '@/stores/utils/streamDebug';
+import { copyTextToClipboard as copyPlainTextToClipboard } from '@/lib/clipboard';
 
 export interface DebugMessageInfo {
   messageId: string;
@@ -373,13 +374,14 @@ export const debugUtils = {
     return JSON.stringify(report, null, 2);
   },
 
+  async copyTextToClipboard(text: string) {
+    return copyPlainTextToClipboard(text);
+  },
+
   async copyDiagnosticsReport() {
     const report = await this.buildDiagnosticsReport();
-    if (typeof navigator !== 'undefined' && navigator.clipboard) {
-      await navigator.clipboard.writeText(report);
-      return { ok: true, report } as const;
-    }
-    return { ok: false, report } as const;
+    const result = await this.copyTextToClipboard(report);
+    return { ...result, report } as const;
   },
 
    checkLastMessage() {