fix(clipboard): implement copyText utility and refactor copy logic in components

frontend/src/components/buckets/ObjectDetailsView.tsx

@@ -11,6 +11,7 @@ import { ConfirmDialog } from '@/components/ui/confirm-dialog';
 import { ObjectPreview } from '@/components/buckets/ObjectPreview';
 import { ArrowLeft, ChevronRight, Copy, Download, File, Loader2, Trash2 } from 'lucide-react';
 import { toast } from 'sonner';
+import { copyText } from '@/lib/clipboard';
 import { downloadObject, formatBytes } from '@/lib/file-utils';
 import { formatDate } from '@/lib/utils';
 
@@ -90,9 +91,9 @@ export function ObjectDetailsView() {
   const backHref = `/buckets/${bucketName}/objects${parentPath ? `?prefix=${encodeURIComponent(parentPath + '/')}` : ''}`;
   const pathSegments = parentPath ? parentPath.split('/').filter(Boolean) : [];
 
-  const copy = (text: string, label = 'Copied') => {
-    navigator.clipboard.writeText(text);
-    toast.success(label);
+  const copy = async (text: string, label = 'Copied') => {
+    if (await copyText(text)) toast.success(label);
+    else toast.error('Failed to copy');
   };
 
   const handleDownload = () => {

frontend/src/components/layout/bucket-detail-shell.tsx

@@ -4,6 +4,7 @@ import { IconTile } from '@/components/ui/icon-tile';
 import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';
 import { cn } from '@/lib/utils';
+import { copyText } from '@/lib/clipboard';
 import { useBuckets } from '@/hooks/useApi';
 import { useBucketCan } from '@/hooks/usePermissions';
 import { toast } from 'sonner';
@@ -43,12 +44,8 @@ export function BucketDetailShell() {
 
   const s3Url = `s3://${bucketName}`;
   const copyUrl = async () => {
-    try {
-      await navigator.clipboard.writeText(s3Url);
-      toast.success('URL copied');
-    } catch {
-      toast.error('Failed to copy');
-    }
+    if (await copyText(s3Url)) toast.success('URL copied');
+    else toast.error('Failed to copy');
   };
 
   return (

frontend/src/components/ui/credential-field.tsx

@@ -1,6 +1,7 @@
 import { useState } from 'react';
 import { Check, Copy, Eye, EyeOff, Loader2 } from 'lucide-react';
 import { cn } from '@/lib/utils';
+import { copyText } from '@/lib/clipboard';
 import { Button } from '@/components/ui/button';
 import { toast } from 'sonner';
 
@@ -21,30 +22,39 @@ export function CredentialField({
 }) {
   const [copied, setCopied] = useState(false);
   const [revealed, setRevealed] = useState(!maskable);
-  const copy = () => {
+  const copy = async () => {
     if (!value) return;
-    navigator.clipboard.writeText(value);
+    if (!(await copyText(value))) {
+      toast.error(`Could not copy ${label}. Select it and copy by hand.`);
+      return;
+    }
     setCopied(true);
     toast.success(`${label} copied`);
     setTimeout(() => setCopied(false), 1600);
   };
+  // Copying focuses a textarea on the fallback path, which would clear whatever
+  // the user just highlighted, so a click that ends a selection copies nothing.
+  const copyUnlessSelecting = () => {
+    if (!window.getSelection()?.toString()) copy();
+  };
   const display = loading ? '' : revealed || !maskable ? value : '•'.repeat(Math.min(40, value.length || 40));
+  const copyable = !loading && !!value;
   return (
     <div className="space-y-1.5">
       <label className="text-[12px] font-medium uppercase tracking-[0.06em] text-[var(--muted-foreground)]">
         {label}
       </label>
       <div className="flex items-stretch gap-2">
-        <button
-          type="button"
-          onClick={copy}
-          disabled={loading || !value}
-          title="Click to copy"
+        {/* A div, not a button: browsers set user-select: none on buttons, which
+            left the value impossible to highlight when copying failed. Keyboard
+            users copy through the button next to it. */}
+        <div
+          onClick={copyable ? copyUnlessSelecting : undefined}
+          title={copyable ? 'Click to copy' : undefined}
           className={cn(
             'flex-1 min-w-0 rounded-md border border-[var(--border)] bg-[var(--surface-sunken)]',
-            'px-3 py-2 text-left text-[13.5px] transition-colors hover:bg-[var(--accent)]',
-            'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[var(--ring)]',
-            'disabled:cursor-not-allowed disabled:opacity-70 disabled:hover:bg-[var(--surface-sunken)]',
+            'px-3 py-2 text-[13.5px] transition-colors',
+            copyable ? 'cursor-pointer hover:bg-[var(--accent)]' : 'opacity-70',
             mono && 'font-mono',
             breakAll ? 'break-all' : 'truncate',
           )}
@@ -57,7 +67,7 @@ export function CredentialField({
           ) : (
             display
           )}
-        </button>
+        </div>
         {maskable && (
           <Button
             variant="secondary"

frontend/src/lib/clipboard.ts

@@ -0,0 +1,34 @@
+/**
+ * Copy text to the clipboard, returning whether it worked.
+ *
+ * navigator.clipboard only exists in a secure context, and garage-ui is usually
+ * reached over plain HTTP, so the clipboard object is often missing entirely.
+ * The deprecated execCommand path still works there and in every browser we
+ * support, so it stays as the fallback.
+ */
+export async function copyText(text: string): Promise<boolean> {
+  try {
+    if (navigator.clipboard) {
+      await navigator.clipboard.writeText(text);
+      return true;
+    }
+  } catch {
+    // Permission denied or an unfocused document, fall through.
+  }
+
+  const area = document.createElement('textarea');
+  area.value = text;
+  area.setAttribute('readonly', '');
+  area.style.position = 'fixed';
+  area.style.opacity = '0';
+  document.body.appendChild(area);
+  try {
+    area.focus();
+    area.select();
+    return document.execCommand('copy');
+  } catch {
+    return false;
+  } finally {
+    area.remove();
+  }
+}

frontend/src/pages/AccessControl.tsx

@@ -1,5 +1,6 @@
-import {useEffect, useMemo, useState} from 'react';
+import {useEffect, useMemo, useState, type MouseEvent} from 'react';
 import {cn} from '@/lib/utils';
+import {copyText} from '@/lib/clipboard';
 import {PageHeader} from '@/components/ui/page-header';
 import {Button} from '@/components/ui/button';
 import {Input} from '@/components/ui/input';
@@ -36,6 +37,13 @@ import type {AccessKey, Bucket, BucketPermission} from '@/types';
 import {AlertTriangle, Calendar, Copy, Database, Edit, Key, KeyRound, Loader2, MoreVertical, Plus, Search, ShieldCheck, ShieldX, Trash2,} from 'lucide-react';
 import {toast} from 'sonner';
 
+// Copying must not also open the key's row.
+async function copyAccessKeyId(e: MouseEvent, accessKeyId: string) {
+  e.stopPropagation();
+  if (await copyText(accessKeyId)) toast.success('Access Key ID copied to clipboard');
+  else toast.error('Failed to copy');
+}
+
 export function AccessControl() {
   const queryClient = useQueryClient();
   const [keys, setKeys] = useState<AccessKey[]>([]);
@@ -480,11 +488,7 @@ export function AccessControl() {
                           <div className="flex items-center gap-2">
                             <code
                               className="text-xs bg-muted px-2 py-1 rounded truncate max-w-[150px] block cursor-pointer hover:bg-muted/80 transition-colors"
-                              onClick={(e) => {
-                                e.stopPropagation();
-                                navigator.clipboard.writeText(key.accessKeyId);
-                                toast.success('Access Key ID copied to clipboard');
-                              }}
+                              onClick={(e) => copyAccessKeyId(e, key.accessKeyId)}
                             >
                               {key.accessKeyId}
                             </code>
@@ -492,11 +496,7 @@ export function AccessControl() {
                               variant="ghost"
                               size="icon"
                               className="h-6 w-6 flex-shrink-0"
-                              onClick={(e) => {
-                                e.stopPropagation();
-                                navigator.clipboard.writeText(key.accessKeyId);
-                                toast.success('Access Key ID copied to clipboard');
-                              }}
+                              onClick={(e) => copyAccessKeyId(e, key.accessKeyId)}
                             >
                               <Copy className="h-3 w-3" />
                             </Button>