feat(a11y): add ARIA attributes and focus trap to Modal component

- Add role="dialog" and aria-modal="true" to modal container
- Add aria-labelledby linked to title element
- Integrate useDialogFocus hook for focus management
- Wrap content with FocusLock from react-focus-lock
- Add triggerRef prop for focus restoration
- Add titleId prop for custom aria-labelledby
- Preserve existing Escape key and backdrop click behavior

src/renderer/src/components/ui/Modal.tsx

@@ -4,8 +4,10 @@
  * A reusable modal dialog component.
  */
 
-import React, { useEffect, useCallback } from 'react'
+import React, { useEffect, useCallback, useRef } from 'react'
 import { X } from 'lucide-react'
+import FocusLock from 'react-focus-lock'
+import { useDialogFocus } from '../../hooks/useDialogFocus'
 
 interface ModalProps {
   isOpen: boolean
@@ -14,6 +16,10 @@ interface ModalProps {
   children: React.ReactNode
   size?: 'sm' | 'md' | 'lg' | 'xl' | '2xl' | '3xl'
   showCloseButton?: boolean
+  /** Ref to the element that triggered opening the modal (for focus restoration) */
+  triggerRef?: React.RefObject<HTMLElement | null>
+  /** ID of the title element (for aria-labelledby) */
+  titleId?: string
 }
 
 const sizeStyles: Record<string, string> = {
@@ -31,9 +37,24 @@ export function Modal({
   title,
   children,
   size = 'md',
-  showCloseButton = true
+  showCloseButton = true,
+  triggerRef,
+  titleId
 }: ModalProps) {
-  // Handle escape key
+  const dialogRef = useRef<HTMLDivElement>(null)
+
+  // Generate unique title ID if not provided
+  const generatedTitleId = titleId || `modal-title-${Math.random().toString(36).substr(2, 9)}`
+
+  // Setup focus management
+  const { focusLockProps } = useDialogFocus({
+    isOpen,
+    dialogRef,
+    onClose,
+    triggerRef: triggerRef || undefined
+  })
+
+  // Handle escape key (maintained for backward compatibility, useDialogFocus also handles this)
   const handleKeyDown = useCallback(
     (event: KeyboardEvent) => {
       if (event.key === 'Escape') {
@@ -46,48 +67,59 @@ export function Modal({
   useEffect(() => {
     if (isOpen) {
       document.addEventListener('keydown', handleKeyDown)
-      document.body.style.overflow = 'hidden'
     }
 
     return () => {
       document.removeEventListener('keydown', handleKeyDown)
-      document.body.style.overflow = 'unset'
     }
   }, [isOpen, handleKeyDown])
 
   if (!isOpen) return null
 
   return (
-    <div className="fixed inset-0 z-50 overflow-y-auto">
-      {/* Backdrop */}
-      <div className="fixed inset-0 bg-black bg-opacity-50 transition-opacity" onClick={onClose} />
-
-      {/* Modal container */}
-      <div className="flex min-h-full items-center justify-center p-4">
+    <FocusLock {...focusLockProps}>
+      <div className="fixed inset-0 z-50 overflow-y-auto">
+        {/* Backdrop */}
         <div
-          className={`relative w-full ${sizeStyles[size]} bg-white rounded-lg shadow-xl transform transition-all`}
-          onClick={(e) => e.stopPropagation()}
-        >
-          {/* Header */}
-          {(title || showCloseButton) && (
-            <div className="flex items-center justify-between px-6 py-4 border-b border-gray-200">
-              {title && <h3 className="text-lg font-semibold text-gray-900">{title}</h3>}
-              {showCloseButton && (
-                <button
-                  onClick={onClose}
-                  className="p-1 text-gray-400 hover:text-gray-600 focus:outline-none focus:ring-2 focus:ring-blue-500 rounded"
-                >
-                  <X className="w-5 h-5" />
-                </button>
-              )}
-            </div>
-          )}
+          className="fixed inset-0 bg-black bg-opacity-50 transition-opacity"
+          onClick={onClose}
+        />
 
-          {/* Content */}
-          <div className="px-6 py-4">{children}</div>
+        {/* Modal container */}
+        <div className="flex min-h-full items-center justify-center p-4">
+          <div
+            ref={dialogRef}
+            className={`relative w-full ${sizeStyles[size]} bg-white rounded-lg shadow-xl transform transition-all`}
+            role="dialog"
+            aria-modal="true"
+            aria-labelledby={generatedTitleId}
+            onClick={(e) => e.stopPropagation()}
+          >
+            {/* Header */}
+            {(title || showCloseButton) && (
+              <div className="flex items-center justify-between px-6 py-4 border-b border-gray-200">
+                {title && (
+                  <h3 id={generatedTitleId} className="text-lg font-semibold text-gray-900">
+                    {title}
+                  </h3>
+                )}
+                {showCloseButton && (
+                  <button
+                    onClick={onClose}
+                    className="p-1 text-gray-400 hover:text-gray-600 focus:outline-none focus:ring-2 focus:ring-blue-500 rounded"
+                  >
+                    <X className="w-5 h-5" />
+                  </button>
+                )}
+              </div>
+            )}
+
+            {/* Content */}
+            <div className="px-6 py-4">{children}</div>
+          </div>
         </div>
       </div>
-    </div>
+    </FocusLock>
   )
 }