fix: ForkModal accessibility and UX (escape, click-outside, labels, maxLength)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/library/ForkModal.tsx

@@ -1,4 +1,4 @@
-import { useState } from 'react'
+import { useState, useEffect } from 'react'
 import { GitBranch, X } from 'lucide-react'
 import { treesApi } from '@/api/trees'
 import { toast } from '@/lib/toast'
@@ -18,6 +18,14 @@ export function ForkModal({ treeId, treeName, onClose }: ForkModalProps) {
   const [isSubmitting, setIsSubmitting] = useState(false)
   const [error, setError] = useState<string | null>(null)
 
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') onClose()
+    }
+    document.addEventListener('keydown', handleKeyDown)
+    return () => document.removeEventListener('keydown', handleKeyDown)
+  }, [onClose])
+
   const handleSubmit = async (e: React.FormEvent) => {
     e.preventDefault()
     if (!name.trim()) return
@@ -40,8 +48,14 @@ export function ForkModal({ treeId, treeName, onClose }: ForkModalProps) {
   }
 
   return (
-    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 p-4">
-      <div className="w-full max-w-md rounded-xl border border-border bg-card shadow-xl">
+    <div
+      className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 p-4"
+      onClick={onClose}
+    >
+      <div
+        className="w-full max-w-md rounded-xl border border-border bg-card shadow-xl"
+        onClick={(e) => e.stopPropagation()}
+      >
         {/* Header */}
         <div className="flex items-center justify-between border-b border-border px-5 py-4">
           <div className="flex items-center gap-2">
@@ -50,6 +64,7 @@ export function ForkModal({ treeId, treeName, onClose }: ForkModalProps) {
           </div>
           <button
             onClick={onClose}
+            aria-label="Close"
             className="rounded-md p-1 text-muted-foreground hover:bg-accent hover:text-foreground"
           >
             <X className="h-4 w-4" />
@@ -59,15 +74,17 @@ export function ForkModal({ treeId, treeName, onClose }: ForkModalProps) {
         {/* Body */}
         <form onSubmit={handleSubmit} className="space-y-4 px-5 py-4">
           <div>
-            <label className="mb-1.5 block text-xs font-medium text-muted-foreground">
+            <label htmlFor="fork-name" className="mb-1.5 block text-xs font-medium text-muted-foreground">
               Name <span className="text-red-400">*</span>
             </label>
             <input
+              id="fork-name"
               type="text"
               value={name}
               onChange={(e) => setName(e.target.value)}
               required
               autoFocus
+              maxLength={255}
               className={cn(
                 'w-full rounded-lg border border-border bg-card px-3 py-2 text-sm text-foreground',
                 'placeholder:text-muted-foreground focus:border-primary focus:outline-none focus:ring-1 focus:ring-primary/20'
@@ -76,11 +93,12 @@ export function ForkModal({ treeId, treeName, onClose }: ForkModalProps) {
           </div>
 
           <div>
-            <label className="mb-1.5 block text-xs font-medium text-muted-foreground">
+            <label htmlFor="fork-reason" className="mb-1.5 block text-xs font-medium text-muted-foreground">
               Reason for Forking{' '}
               <span className="text-muted-foreground/60">(optional)</span>
             </label>
             <textarea
+              id="fork-reason"
               value={forkReason}
               onChange={(e) => setForkReason(e.target.value)}
               rows={3}
@@ -108,7 +126,7 @@ export function ForkModal({ treeId, treeName, onClose }: ForkModalProps) {
             <button
               type="submit"
               disabled={isSubmitting || !name.trim()}
-              className="bg-gradient-brand flex items-center gap-2 rounded-lg px-4 py-2 text-sm font-medium text-white shadow-lg shadow-primary/20 hover:opacity-90 disabled:opacity-40"
+              className="bg-gradient-brand flex items-center gap-2 rounded-lg px-4 py-2 text-sm font-medium text-white shadow-lg shadow-primary/20 hover:opacity-90 disabled:opacity-40 disabled:cursor-not-allowed"
             >
               {isSubmitting ? 'Forking…' : 'Fork Flow'}
             </button>