fix(canvas/a11y): dialog aria-modal, icon-button labels, focus management

- CookieConsent.tsx: add aria-modal="true" (WCAG 2.1.1)
- ConsoleModal.tsx: add useRef + requestAnimationFrame focus management on open
- ConversationTraceModal.tsx: remove redundant aria-describedby={undefined}
- FileTree.tsx: add aria-label to directory/file delete buttons (WCAG 4.1.2)
- FileEditor.tsx: add aria-label to download button (WCAG 4.1.2)
- ScheduleTab.tsx: add aria-label to Run Now, Edit, Delete icon buttons
- form-inputs.tsx: add aria-label to tag removal button

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

canvas/src/components/ConsoleModal.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useEffect, useState } from "react";
+import { useEffect, useRef, useState } from "react";
 import { createPortal } from "react-dom";
 import { api } from "@/lib/api";
 import { showToast } from "@/components/Toaster";
@@ -27,11 +27,21 @@ export function ConsoleModal({ workspaceId, workspaceName, open, onClose }: Prop
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState<string | null>(null);
   const [mounted, setMounted] = useState(false);
+  const closeButtonRef = useRef<HTMLButtonElement>(null);
 
   useEffect(() => {
     setMounted(true);
   }, []);
 
+  // Focus close button when modal opens
+  useEffect(() => {
+    if (!open) return;
+    const raf = requestAnimationFrame(() => {
+      closeButtonRef.current?.focus();
+    });
+    return () => cancelAnimationFrame(raf);
+  }, [open]);
+
   useEffect(() => {
     if (!open) return;
     let ignore = false;
@@ -99,6 +109,7 @@ export function ConsoleModal({ workspaceId, workspaceName, open, onClose }: Prop
             )}
           </div>
           <button
+            ref={closeButtonRef}
             onClick={onClose}
             aria-label="Close"
             className="text-zinc-400 hover:text-zinc-100 text-sm px-2"

canvas/src/components/ConversationTraceModal.tsx

@@ -97,7 +97,6 @@ export function ConversationTraceModal({ open, workspaceId: _workspaceId, onClos
         <Dialog.Content
           className="fixed inset-0 z-[60] flex items-center justify-center p-4"
           aria-label="Conversation trace"
-          aria-describedby={undefined}
         >
           {/* Modal panel */}
           <div className="relative bg-zinc-900 border border-zinc-700 rounded-xl shadow-2xl max-w-[700px] w-full max-h-[85vh] flex flex-col overflow-hidden">

canvas/src/components/CookieConsent.tsx

@@ -88,6 +88,7 @@ export function CookieConsent() {
   return (
     <div
       role="dialog"
+      aria-modal="true"
       aria-labelledby="cookie-consent-title"
       aria-describedby="cookie-consent-body"
       className="fixed bottom-0 left-0 right-0 z-[9999] border-t border-zinc-800 bg-zinc-950/95 backdrop-blur-sm p-4 shadow-[0_-4px_12px_rgba(0,0,0,0.4)]"

canvas/src/components/tabs/FilesTab/FileEditor.tsx

@@ -55,8 +55,8 @@ export function FileEditor({
           {success && <span className="text-[9px] text-emerald-400">{success}</span>}
           <button
             onClick={onDownload}
+            aria-label="Download file"
             className="text-[10px] text-zinc-500 hover:text-zinc-300"
-            title="Download file"
           >
             ↓
           </button>

canvas/src/components/tabs/FilesTab/FileTree.tsx

@@ -66,6 +66,7 @@ function TreeItem({
           <span className="text-[10px]">📁</span>
           <span className="text-[10px] text-zinc-400 flex-1">{node.name}</span>
           <button
+            aria-label={`Delete ${node.name}`}
             onClick={(e) => {
               e.stopPropagation();
               onDelete(node.path);
@@ -102,6 +103,7 @@ function TreeItem({
       <span className="text-[9px]">{getIcon(node.name, false)}</span>
       <span className="text-[10px] flex-1 truncate font-mono">{node.name}</span>
       <button
+        aria-label={`Delete ${node.name}`}
         onClick={(e) => {
           e.stopPropagation();
           onDelete(node.path);

canvas/src/components/tabs/ScheduleTab.tsx

@@ -351,6 +351,7 @@ export function ScheduleTab({ workspaceId }: Props) {
                 <div className="flex items-center gap-1 flex-shrink-0">
                   <button
                     onClick={() => handleRunNow(sched)}
+                    aria-label={`Run schedule ${sched.name} now`}
                     className="text-[11px] px-1.5 py-0.5 text-blue-400 hover:bg-blue-600/20 rounded transition-colors"
                     title="Run now"
                   >
@@ -358,6 +359,7 @@ export function ScheduleTab({ workspaceId }: Props) {
                   </button>
                   <button
                     onClick={() => handleEdit(sched)}
+                    aria-label={`Edit schedule ${sched.name}`}
                     className="text-[11px] px-1.5 py-0.5 text-zinc-400 hover:bg-zinc-700 rounded transition-colors"
                     title="Edit"
                   >
@@ -365,6 +367,7 @@ export function ScheduleTab({ workspaceId }: Props) {
                   </button>
                   <button
                     onClick={() => setPendingDelete({ id: sched.id, name: sched.name })}
+                    aria-label={`Delete schedule ${sched.name}`}
                     className="text-[11px] px-1.5 py-0.5 text-red-400 hover:bg-red-600/20 rounded transition-colors"
                     title="Delete"
                   >

canvas/src/components/tabs/config/form-inputs.tsx

@@ -97,7 +97,7 @@ export function TagList({ label, values, onChange, placeholder }: { label: strin
         {values.map((v, i) => (
           <span key={i} className="inline-flex items-center gap-1 px-1.5 py-0.5 bg-zinc-800 border border-zinc-700 rounded text-[10px] text-zinc-300 font-mono">
             {v}
-            <button onClick={() => onChange(values.filter((_, j) => j !== i))} className="text-zinc-500 hover:text-red-400">×</button>
+            <button aria-label={`Remove tag ${v}`} onClick={() => onChange(values.filter((_, j) => j !== i))} className="text-zinc-500 hover:text-red-400">×</button>
           </span>
         ))}
       </div>